Opinion for the court filed by Circuit Judge HENDERSON.
Dissenting opinion filed by Circuit Judge RANDOLPH.
KAREN LeCRAFT HENDERSON, Circuit Judge:The Seattle Opera (Opera) petitions for review of a February 8, 2001 decision and order of the National Labor Relations Board (Board or NLRB). See Seattle Opera Ass’n & Am. Guild of Musical Artists, Case 19-CA-27288 (Feb. 8, 2001). In the order, the Board held that the Opera’s refusal to bargain with the American Guild of Musical Artists (Union) — after the Union was certified as the collective bargaining representative of an allegedly appropriate unit of the Opera’s employees — constituted an unfair labor practice (ULP) under section 8(a)(5) and (1) of the National Labor Relations Act (Act), 29 U.S.C. § 158(a)(5), (1). On review, the Opera does not dispute that it refused to bargain with the Union. Instead, it contests the Board’s conclusion that the Opera’s auxiliary choristers are “employees” under the Act and that, as employees, they were properly included in the bargaining unit. In the alternative, the Opera argues that, even if the auxiliaries are employees, they are casual employees lacking a sufficient community of interest with other Opera employees to be included in the bargaining unit. The Opera’s contentions .are without merit; we therefore deny its petition for review and grant the NLRB’s cross-application for enforcement of its order.
I.
The Union represents a bargaining unit of choristers, dancers, stage managers, assistant stage managers and assistant stage directors of the Opera. The collective bargaining agreement between the Opera and the Union sets forth several categories of choristers — regular choristers, temporary regular choristers, alternate choristers and auxiliary choristers. The Opera produces approximately five operas per season and employs 36 regular choristers to fill its basic seasonal chorus requirement. Regular choristers are required to perform in at least half of the operas offered per season and, in order to maintain their regular-chorister status, must undergo periodic auditions and evaluations. Under the agreement, each regular chorister is paid at least $160 “for any single performance” and $16 per hour “for each hour of rehearsal or fraction thereof.” Joint Appendix (JA) 83. They are eligible to receive a parking reimbursement of $5 per performance or rehearsal if they submit an expense- reimbursement form with “available receipts.” JA 90.
' The' Opera has a pool of 100 to 200 auxiliary choristers who audition before a musical committee. From the pool of auxiliaries, the Opera selects up to 16 “alternate choristers” to fill additional openings in the chorus when a production requires more than 36 regulars or when regulars are unavailable. If a regular takes a leave of absence, his replacement is designated a “temporary regular chorister.” Aternate choristers are given a right of first refusal to perform as temporary regulars. When alternates perform as “alternate choristers,” they receive $20 for each rehearsal and performance; when they perform as “temporary regular choristers,” they are paid at the higher regular-chorister rate described above and, like regulars, are eligible to receive a parking reimbursement of $5 per rehearsal or performance if they *760submit an expense reimbursement form with “available receipts.” JA 90.
Like alternates, those auxiliaries who have not been selected as alternates may yet be called upon to perform when a production requires more than 36 choristers.1 Moreover, if the Opera cannot fill the temporary regular chorister positions with alternates, it often relies on auxiliaries to fill the empty slots. Once selected for a given production, an auxiliary signs a letter of-intent agreeing to be available for all rehearsals and performances; he also signs a letter of understanding by which he agrees to adhere to the attendance and decorum requirements spelled out in a handbook provided by the Opera. The auxiliary receives a flat fee of $214 for the production, whether he incurs expenses-or not; he is not required to submit any receipts or forms to receive the full fee. The Opera originally considered the $214 fee an “honorarium” but now calls it a “transportation expense” reimbursement.
All choristers performing in a given production — be they regulars, temporary regulars, alternates or auxiliaries — are listed together in the program under the heading of “Chorus.” Auxiliaries share dressing facilities and receive makeup instructions and costume fittings with the other choristers. Also, during the production, auxiliaries often perform with regular choristers in “small group” performances. At least half of the current regular choristers began with the Opera as auxiliaries.2
On March 30, 2000 the Union petitioned for a self-determination election among the Opera’s alternate and auxiliary choristers,3 in an effort to add the alternates and auxiliaries to the bargaining unit. The Opera agreed that the alternates could be included in the unit but objected to the inclusion of the auxiliaries, protesting that they are not employees under the Act.
On May 3, 2000 the Board’s Regional Director for Region 19 agreed that the auxiliaries are not employees under the Act and therefore could not be included in the bargaining unit. See Seattle Opera Ass’n & Am. Guild of Musical Artists, Case 19-RC-13939 (May 3, 2000). On August 24, 2000 the Board reversed the Regional Director, holding that the auxiliaries are employees under the Act. See Seattle Opera Ass’n & Am. Guild of Musical Artists, Case 19-RC-13939 (Aug. 24, 2000). The Board remanded to the Regional Director the unresolved question whether the auxiliaries are casual employees. On September 20, 2000 the Regional Director issued a supplemental decision holding that the auxiliaries are not merely casual employees and that adding them to the bargaining unit would be appropriate. See Seattle Opera Ass’n & Am. Guild of Musical Artists, Case 19-RC-13939 (Sept. 20, 2000). He directed an election in which the auxiliaries were to decide “whether or not they desire to be represented for collective bargaining purposes by [the Union].” JA 15. The Board then conducted an election by secret mail ballot. The Union won the election and the Board certified it on November 14, 2000 as “the exclusive collective-bargaining representa*761tive of the employees in the following appropriate unit: All alternate and auxiliary choristers employed by [the Opera].” JA 25.
After its certification, the Union requested that the Opera bargain with it over the auxiliaries’ terms of employment. The Opera refused and the Union filed a ULP charge. On December 13, 2000 the Regional Director issued a complaint alleging that the Opera’s refusal to bargain violated the Act. The Opera filed an answer admitting its refusal to bargain but also challenging the validity of the Union’s certification.' The Regional Director moved for summary judgment and the Opera responded to the motion by claiming that the auxiliaries are not employees under the Act. On February 8, 2001 the Board issued the order under review. The Board found that “[a]ll representation issues raised by the [Opera] were or could have been litigated in the prior representation proceeding,” JA 25; accordingly, it affirmed its August 24, 2000 holding that the auxiliaries are employees under the Act. Thus, because the auxiliaries were properly included in the bargaining unit, the Board concluded that the Opera had violated section 8(a)(5) and (1) of the Act by refusing to bargain with the Union. It ordered the Opera to cease and desist from engaging in similar ULPs; to recognize and bargain with the Union upon request; to embody in a signed agreement any understanding reached; and to post copies of a remedial notice.
II.
The Opera asks us to grant its petition and reinstate the Regional Director’s initial decision because, it claims, the auxiliaries are not employees within the Act’s coverage. In the alternative, the Opera argues that the auxiliaries are merely casual employees lacking a sufficient community of interest with other Opera employees to be included in a bargaining unit. In addressing the Opera’s contentions, we do not undertake a de novo inquiry. See Physicians Nat’l House Staff Ass’n v. Fanning, 642 F.2d 492, 496-97 (D.C.Cir.1980) (en banc) (“Whether a particular individual is an employee depends upon the facts. The task of decision on the facts of each case ... has been assigned primarily to [the Board,] the agency created by Congress to administer the Act.” (quotations omitted)); see also 29 U.S.C. § 160(e) (“The findings of the Board with respect to questions of fact if supported by substantial evidence on the record considered as a whole shall be conclusive.”). Rather, we must ask whether the “Board’s determination that [the auxiliaries] are ‘employees’ under [the] Act ... has warrant in the record and a reasonable basis in law.” Allied Chem. & Alkali Workers of Am. v. Pittsburgh Plate Glass Co., 404 U.S. 157, 166, 92 S.Ct. 383, 30 L.Ed.2d 341 (1971) (quotations omitted). We conclude that it does.
A.
With respect to the Opera’s first claim — that the auxiliaries are not employees within the Act’s purview — “our inquiry starts from the fundamental canon that statutory interpretation begins with the language of the statute itself.” Butler v. West, 164 F.3d 634, 639 (D.C.Cir.1999) (quotation omitted). The relevant statutory text states:
The term “employee” shall include any employee, and shall not be limited to the employees of a particular employer, unless this subchapter explicitly states otherwise, and shall include any individual whose work has ceased as a consequence of, or in connection with, any current . labor dispute or because of any unfair labor practice, and who has not obtained any other regular and substantially equivalent employment, but shall not include any individual employed as an ag*762ricultural laborer, or in the domestic service of any family or person at his home, or any individual employed by his parent or spouse, or any individual having the status of an independent contractor, or any individual employed as a supervisor, or any individual employed by an employer subject to the Railway Labor Act, as amended from time to time, or by any other person who is not an employer as herein defined.
29 U.S.C. § 152(3) (emphasis added).
While the statutory definition is somewhat unhelpful, we are not without guidance; in Sure-Tan, Inc. v. NLRB, 467 U.S. 883, 104 S.Ct. 2803, 81 L.Ed.2d 732 (1984), the United States Supreme Court made clear that
[t]he breadth of § 2(3)’s definition is striking: the Act squarely applies to “any employee.” The only limitations are specific exemptions for agricultural laborers, domestic workers, individuals employed by their spouses or parents, individuals employed as independent contractors or supervisors, and individuals employed by a person who is not an employer under the [Act].
Id. at 891, 104 S.Ct. 2803 (emphasis added). Because the Opera does not claim that the auxiliaries fall within any of section 152(3)’s specific exemptions, resolution of the Opera’s petition turns on the provision’s opening words: “The term ‘employee’ shall include any employee.... ” See id.; see also Sunland Constr. Co., 309 N.L.R.B. 1224, 1226 (1992) (“Under the well settled principle of statutory construction — expressio unius est exclusio alteri-us — only these enumerated classifications are excluded from the definition of ‘employee.’ ” (footnote omitted)). Although the words might appear hopelessly circular, the Court’s decision in NLRB v. Town & Country Electric, Inc., 516 U.S. 85, 116 S.Ct. 450, 133 L.Ed.2d 371 (1995), provides the necessary interpretive assistance:
The ordinary dictionary definition of “employee” includes any “person who works for another in return for financial or other compensation.” American Heritage Dictionary 604 (3d ed.1992). See also Black’s Law Dictionary 525 (6th ed.1990) (an employee is a “person in the service of another under any contract of hire, express or implied, oral or written, where the employer has the power or right to control and direct the employee in the material details of how the work is to be performed”). The phrasing of the Act ... reiterate[s] the breadth of the ordinary dictionary definition [when] it says “[t]he term ‘employee’ shall include any employee.”
Id. at 90, 116 S.Ct. 450 (emphasis in original). Given that the Court has assigned such weight to the plain meaning of the term “employee,” it is clear that — where he is not specifically excluded from coverage by one of section 152(3)’s enumerated exemptions — the person asserting statutory employee status does have such status if (1) he works for a statutory employer in return for financial or other compensation, see id.; see also WBAI Pacifica Found., 1999 WL 676522, at *3 (N.L.R.B. Aug.26, 1999) (requiring “presence of some form of economic relationship between the employer and the individual held to have statutory employee status”); and (2) the statutory employer has the power or right to control and direct the person in the material details of how such work is to be performed, see Town & Country Elec., 516 U.S. at 90, 116 S.Ct. 450.
The Opera concedes that auxiliary choristers receive a flat sum of $214 for their work in a particular production.4 It argues, however, that the fee “is not intended to be ‘compensation’ in return for *763labor or services performed ... but rather a reimbursement for out of pocket costs an [auxiliary] is likely to incur” in connection with attending rehearsals and performances. Br. of Pet’r at 17. Several facts in the record suggest otherwise. First, the auxiliaries receive $214, no more and no less, regardless of the amount of any transportation, parking and other miscellaneous expenses they incur. We note the contrast in this regard between the auxiliaries on the one hand and the Opera’s non-employee “supernumeraries”5 and youth choristers on the other; the latter are true volunteers in that they receive no fee at all (regardless of the amount of expenses they incur). Second, the auxiliaries are entitled to the fee even if they incur no expenses at all (e.g., if they walk to the opera house or if a friend drops them off). Third, while the Opera labels the fee a “transportation expense” reimbursement,6 the auxiliaries are not required to submit expense reimbursement forms or receipts to receive the full sum.7 Indeed, that the Opera did not explain to the Board how it arrived at the $214 “transportation expense” set-off— much less present evidence of parking costs or distances traveled — bolsters the Board’s conclusion that the remuneration qualifies as compensation for the auxiliaries’ work.8 See JA 10. Nothing *764in the record justifies our disturbing that conclusion.9
*765Moreover, the record shows that the Opera possesses the right to control the auxiliary choristers in the material details of their performance. Auxiliaries are required to sign letters of understanding and intent agreeing to adhere to the attendance and decorum requirements spelled out in a handbook provided by the Opera.10 The Opera requires the auxiliaries to sign in when they arrive, on time, at each and every rehearsal and performance. Pursuant to the handbook, the auxiliaries receive artistic feedback and are expected to follow musical and dramatic direction while on stage. The auxiliaries undergo the same costume fittings and make-up instruction as regular and alternate choristers. In short, like all choristers, auxilia-ríes must sing their part lest the whole production suffer.11
In light of the foregoing facts, as well as the “degree of legal leeway” the Board possesses “when it interprets its governing statute, particularly where Congress likely intended an understanding of labor relations to guide the Act’s application,” Town & Country Elec., 516 U.S. at 90, 116 S.Ct. 450, we cannot say the Board exceeded its authority in concluding that the auxiliary choristers are employees within the meaning and reach of 29 U.S.C. § 152(3).
B.
We reject as well the Opera’s alternative claim — that the auxiliary choristers are casual employees lacking a sufficient community of interest with other *766Opera employees to be included in the bargaining unit — because it is not properly before us.
Its assertions to the contrary notwithstanding, see Reply Br. of Pet’r at 15-17, the Opera failed to preserve for review its casual employee argument. Upon concluding in his supplemental decision that auxiliaries are not casual employees, the Regional Director explicitly advised the Opera of its right, pursuant to 29 C.F.R. § 102.67, to file a request for review of his findings. The Opera never filed such a request. Section 102.67(f), therefore, would have precluded the Board from considering the Opera’s casual employee claim in the ULP proceeding even if the Opera had attempted to raise the claim, which it did not. 29 C.F.R. § 102.67(f); see Alois Box Co. v. NLRB, 216 F.3d 69, 77 (D.C.Cir.2000) (“Because the company did not raise [its argument] in the unfair labor practice proceeding, the Board was entitled to treat [it] as abandoned.”). The Act provides that “[n]o objection that has not been urged before the Board ... shall be considered by the [reviewing] court, unless the failure or neglect to urge such objection shall be excused because of extraordinary circumstances.” 29 U.S.C. § 160(e). The Opera does not allege that extraordinary circumstances exist here. Accordingly, we do not consider its casual employee argument.
III.
For the foregoing reasons, the Opera’s petition for review is denied and the NLRB’s cross-application for enforcement of its February 8, 2001 order is granted.
So ordered.
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. For example, if 53 choristers are needed for a given production, the pool of 16 alternates will not suffice to round out the chorus, even assuming all 36 regulars and all 16 alternates are available for the production.
. The Board found the fact that "performing as an auxiliary chorister counts toward satisfying the prerequisite for employment as a general chorister, i.e., that the applicant has sung in two previous productions,” JA 10, further supported its conclusion that auxiliaries are employees.
.A self-determination election allows unrepresented employees to decide whether or not they want to be added to an existing bargaining unit. See generally St. Mary’s Duluth Clinic Health Sys., 2000 WL 1920362 (N.L.R.B. Dec. 15, 2000).
. This single fact distinguishes the auxiliaries from the nonemployee individuals in WBAI, a *763decision which the dissent claims the Board has erroneously neglected, see dissenting op. at 2; the "unpaid staff” in WBAI were just that — unpaid. See WBAI, 1999 WL 676522, at *4-5 ("Unpaid staff do not receive compensation for their work at the station.... Although there is evidence that at least one unpaid staff member received travel reimbursement, it does not appear to be a widespread practice.”). Thus, the purported employer-employee relationship in WBAI lacked the requisite economic element that exists, and is widespread, here. That the fee, in the dissent's estimation, amounts to "the grand sum of $2.78 per hour” and is below minimum wage, dissenting op. at 773, has no bearing on the section 152(3) analysis. The only support the dissent can marshal for a contrary proposition, Walling v. Portland Terminal Co., 330 U.S. 148, 67 S.Ct. 639, 91 L.Ed. 809 (1947), is no support at all; Walling involves interpretation of the Fair Labor Standards Act. Under the National Labor Relations Act, the amount of (as opposed to the mere fact of) compensation is irrelevant.
. Supernumeraries are analogous to "extras” in a film — they are simply performers with nonspeaking parts.
. 'We decline to lend evidentiary credence to this label, especially given the fact that, until recently, the Opera referred to the flat fee as an "honorarium.”
. The Opera argues that "[wjhether an [a]ux-iliary must request the reimbursement, or provide proof of expenditures for travel and parking, is inconsequential [because] the travel reimbursement is merely intended to be an approximation of travel and parking costs for the typical [ajuxiliary, and Seattle Opera has decided it is not worth the administrative time, effort and cost to collect and process receipts and reimbursement forms.” Br. of Pet’r at 18. It contends that the Board neglected its "cost-efficiency reasoning” in handling the payment to auxiliaries as it did. Id. at 13; see also id. at 17-18. Even if the Opera's cost-efficiency reasons were relevant to the section 152(3) inquiry, however, nothing in the record suggests that it presented those reasons to the Board or that "extraordinary circumstances” prevented it from doing so. Hyatt Mgmt. Corp. of New York, Inc. v. NLRB, 817 F.2d 140, 143 n. 2 (D.C.Cir.1987) (where petitioner failed to raise issue before Board, it was "barred from raising it in a petition for review, absent 'extraordinary circumstances’ which [were] clearly not present” (quoting 29 U.S.C. § 160(e))).
.The dissent seeks to fill the mathematical gap left by the Opera and offers numerous suppositions about how much a given auxiliary might make per hour or per trip. See dissenting op. at 773-74. For instance, the dissent calculates that — far from being compensated for their work performance — auxiliary choristers will not even receive full reimbursement for their travel expenses unless "they live or have a day job within 9.2 miles of the Opera House.” Id. at 774. For all the Board knew, however — given that the Opera proffered neither the calculations the *764dissent offers nor any evidence about distances traveled — all of the auxiliaries lived within 9.2 miles of the opera house. Whether the dissent’s calculations are accurate or not, the Board has no obligation to weigh evidence not presented to it. See Allied Chem. & Alkali Workers, 404 U.S. at 166, 92 S.Ct. 383 (court will uphold Board’s "employee” determination if it "has warrant in the record and a reasonable basis in law” (emphasis added)).
The dissent also supposes that if the auxiliaries are in fact employees under the Act, they and the Opera are in violation of the federal tax laws because they "are not on the payroll” and “no taxes of any sort are withheld from their $214.” Dissenting op. at 776. However, the Opera does not take issue with the Board's omitting to consider the tax treatment of the $214 payments. While the Opera states in its brief that no taxes are withheld from the payments, it never explains the legal significance of the fact. See Br. of Pet’r at 17, 22, 27. Accordingly, by failing to raise the tax argument adequately on appeal, the Opera has waived it. See Wash. Legal Clinic for the Homeless v. Barry, 107 F.3d 32, 39 (D.C.Cir.1997) (litigant does not argue issue by addressing it in "cursory fashion”); Ry. Labor Executives’ Ass’n v. United States R.R. Ret. Bd., 749 F.2d 856, 859 n. 6 (D.C.Cir.1984) (declining to decide issue "on the basis of briefing which consisted of only three sentences ... and no discussion of the... relevant case law"). The dissent’s assertion that we have "unfairly]” declined to consider the tax issue, dissenting op. at 776 n.5, is surprising to say the least; for a party that had purportedly "made the tax argument in its brief not once but three times” (by merely stating the fact that "no taxes are withheld”), id., the Opera at oral argument was caught decidedly off-guard by our dissenting colleague's inquiries:
Q: [D]id they give [the auxiliaries] W-2 forms?
A: I don't believe they did, but I can't tell you for sure that that is in the record. Q: That’s not in the record. Okay.
A: I’m not sure that question was asked [before the Board]....
Q: [I]f "employee” means the same under the Internal Revenue Code that it does under the NLRB, then every one of these 150 [auxiliaries] has violated the federal tax laws.
A: I'm not sure I follow that, Your Hon- or. ...
Q: They didn't report—
A: I don’t know why they should, if it’s reimbursement for expenses.
Q: No. If the NLRB is right ... and "employee” means the same in the Tax Code as it does in the National Labor Relations Act, then they have put 150 people in violation of the federal income tax and they owe back taxes, with penalties.
A: I mean, I would have to go back if— in court — if this Court does not accept our position, we'd have to go back and look at that. But it certainly is a de minimis amount of money.
Infra at 767-69 (Oral Arg. Tr. at 13-15); see also infra at 770-72 (Oral Arg. Tr. at 24-25, 36). The conclusion that our dissenting colleague raised the tax issue sua sponte at oral argument — surprising the Board and thereby precluding it from "suggesting] 'waiver,' " dissenting op. at. 776 n.5' — seems inevitable, especially given that the record contains no evidence whatsoever regarding (1) the Opera’s tax reporting treatment of the $214 payments; or (2) the auxiliaries' reporting or failing to report properly any payments to federal and state taxing authorities.
The Opera’s decision not to argue the tax issue is unsurprising in any event. As counsel for the Board correctly stated at oral argument, the fact that the auxiliaries were not given W-2 forms "doesn't mean that the[y] aren't employees under the Act,” infra at 771 (Oral Arg. Tr. at 25); the tax treatment of the payments is of little analytical significance where "the Board [can] reasonably conclude that ... various indicia of employee status,” like compensation and a right of control, "outweigh those factors suggesting otherwise,” including tax treatment. NLRB v. Amber Delivery Serv., Inc., 651 F.2d 57, 61-62 (1st Cir.1981) (Breyer, J.) (package delivery drivers found to be employees under section 152(3) even though company made no deductions for unemployment, workmen's compensation, social security insurance or income taxes); see J. Huizinga Cartage Co. v. NLRB, 941 F.2d 616, 620 (7th Cir.1991) (same, observing that "if an employer could confer independent contractor [i.e., non-employee] status through the absence of payroll deductions there would be few employees falling under the protection of the Act”); NLRB v. Keystone Floors, Inc., 306 F.2d 560, 561, 563 (3d Cir.1962) (salesmen found to be employees under section 152(3) even though company made no deductions for social security or income tax).
. While the dissent makes much of the Regional Director's calculations, see dissenting *765op. at 773-75 & n.3, the Director's conclusion that the $214 amount is only "sufficient to let an individual roughly break even with out-of-pocket expenses,” JA 5, was based on mere speculation about the travel, parking and meal expenses that the “average” auxiliary chorister might incur and in fact ignored testimony that some auxiliaries incurred no expenses at all.
. The letter of understanding requires an auxiliary to affirm the following by signature:
I have read the Seattle Opera "Auxiliary Handbook” provided for my benefit. I understand these requirements, including those addressing attendance and decorum, and agree to comply as a condition of being considered as an Auxiliary Chorister. If I have any questions, I understand that I can contact the Chorus Personnel Coordinator or the Music Coordinator for clarification. I understand that failure to comply with these guidelines may lead to my dismissal as an Auxiliary Chorister from this production, ' and my removal from consideration as an Auxiliary Chorister from any future opera.
JA 13 (emphasis added).
. The dissent — delivered molto agitato — believes it "outright silly” for the Board or for us to consider that the Opera has the power to control the auxiliary choristers in the material details of their performance. Dissenting op. at 776. The dissent itself acknowledges, however, that the Board can and should consider the common law definition of "employee” when performing a section 152(3) analysis. See id. at 775-76; Nationwide Mut. Ins. Co. v. Darden, 503 U.S. 318, 322-23, 112 S.Ct. 1344, 117 L.Ed.2d 581 (1992) ("[W]hen Congress has used the term 'employee' without [clearly] defining it, we have concluded that Congress intended to describe the conventional master-servant relationship as understood by common-law agency doctrine.”). The Board did not act arbitrarily in finding that there was a master-servant relationship here; the dissent's observation that an opera is an especially "collective enterprise” in which "[ejveiyone has to sing at the same time," dissenting op. at 776, only bolsters the Board’s conclusion. Indeed, had the Board ignored the Opera's amount of control over the auxiliaries, its neglect of the common law definition could have rendered its decision arbitrary and capricious. See Town & Country Elec., 516 U.S. at 94, 116 S.Ct. 450 ("In some cases, there may be a question about whether the Board’s departure from the common law of agency ... renders its interpretation unreasonable.”).