ORDER
On consideration of:
1. AT & T’S PETITION FOR PERMISSION TO APPEAL UNDER SECTION 1292(b) OR, IN THE ALTERNATIVE, ITS MOTION TO CONSTRUE THE COURT’S PRIOR MANDATE, filed on October 22, 1984 by counsel for petitioner.
2. MCI’S ANSWER IN OPPOSITION TO AT & T’S PETITION FOR PERMISSION TO FILE AN INTERLOCUTORY APPEAL, filed on October 29, 1984 by counsel for respondents.
3. MOTION FOR LEAVE TO FILE REPLY TO MCI’S ANSWER IN OPPOSITION TO AT & T’S PETITION FOR PERMISSION TO FILE AN INTERLOCUTORY APPEAL, filed on November 1, 1984 by petitioner.
4. AT & T’S REPLY TO MCI’S ANSWER IN OPPOSITION TO AT & T’S PETITION FOR PERMISSION TO FILE AN INTERLOCUTORY APPEAL, filed on November 1, 1984 by counsel for petitioner.
5. MCI’S MOTION FOR LEAVE TO SUPPLEMENT THE RECORD, filed on November 5, 1984.
6. AT & T’S RESPONSE TO MCI’S MOTION TO SUPPLEMENT THE RECORD.
7. MCI’S MOTION TO FURTHER SUPPLEMENT THE RECORD, filed November 7, 1984.
In January 1983, this Court set aside a $1.8 billion judgment in favor of MCI. We remanded to the district court for a separate trial on the issue of the amount of damages MCI had suffered as a direct result of particular unlawful practices by AT & T. MCI Communications Corp. v. *801American Telephone & Telegraph Co., 708 F.2d 1081 (7th Cir.1983).
Upon remand, AT & T moved to exclude MCI’s evidence that claims damages for services other than private line services. The motion was prompted by the fact that MCI’s currently proposed Lost Profits Study attempts to recover damages based on lost revenue from MCI’s public, fully switched long distance service known as Execunet. The Lost Profits Study used by MCI at the first trial focused on lost revenue from private line services. AT & T reasoned (1) that recovery of Execunet damages is foreclosed by this court’s mandate on the earlier appeal, ordering retrial on the issues of damages only, and (2) that principles of equity bar MCI from attempting recovery of Execunet damages because of MCI’s representations' prior to and at the first trial that Execunet damages were not at issue in this case.
On October 12, 1984, Judge Grady entered an order denying the AT & T motion. In the order, Judge Grady described the MCI theory for claiming lost revenue on Execunet services as follows:
[H]ad [MCI] not lost [private line] revenues as a result of AT & T’s anticompeti-tive conduct, it could have used these revenues to expand Execunet and Network Service earlier and more broadly than it did during the damage period. Plaintiffs argue that the full extent of this damage to Execunet and Network Service was not appreciated at the time of trial and has come to be understood in light of the success these services have enjoyed since the trial.
The practical significance of this approach could be enormous. The jury verdict in the first trial was $600 million, based on a finding of liability on ten charges of anticompetitive conduct. Only seven charges are left, and they do not include HiLo, arguably a major component of the $600 million verdict. Counsel inform me that under the new lost profits study plaintiffs’ damages, before trebling, will be approximately $5 billion (as opposed to a claimed $900 million at the first trial). Of that amount, approximately half will be attributed to lost revenues on Execunet and Network Service.
Judge Grady was not satisfied that the mandate precludes recovery for injury to non-private line service proximately caused by AT & T’s conduct. He did, however, suggest an interlocutory appeal and included in his order a statement in conformity with 28 U.S.C. § 1292(b). He stated the controlling question of law as whether the mandate of the Court of Appeals permits introduction of non-private line damage evidence such as loss of revenues from Execu-net and Network Service.
AT & T petitioned for permission to appeal.
Under the statute, permitting an appeal at this stage is left to our discretion. In the exercise of that discretion, we deny permission. AT & T’s alternative motion, that we construe the mandate, is also denied.
It is at least arguable that MCI is seeking to establish an injury much wider in scope than it sought to establish at the first trial.
The question whether MCI’s present claim of injury to its business of providing Execunet and Network Service is embraced within the issue of liability, and therefore not properly triable under our mandate, or whether it is to be treated as part of the damage issue open to trial under our mandate although not proved at the first trial, is a close and difficult one, as to which we find no precedent. We have before us only the papers filed by the parties in support of and in opposition to the AT & T petition. We have concluded that this question can be more adequately considered on a full record, including the record which will be made at the upcoming trial. The same is true of the question whether MCI’s earlier representations concerning the absence of Execunet issues from this case forclose MCI on equitable principles from asserting its present claim.
The challenged evidence will almost certainly raise other questions which could not be resolved on appeal until the trial record is complete. As Judge Grady observed, there “may be a question as to whether *802evidence of injury to Execunet and Network Service will be too remote and speculative to be admissible.” We have every confidence that as trial judge, he will be cautious in ruling on issues of this type. We assume also that if the current Lost Profits Study or similar evidence be admitted, AT & T will be given an adequate opportunity to show the jury inconsistencies between it and the corresponding evidence propounded by MCI at the first trial, and that MCI will then have an opportunity to offer evidence in explanation of such inconsistencies. Whatever the effect MCI’s explanation of any inconsistency may have upon the findings of the jury, it may well illuminate the question of law whether the broadened claim of damage involves a prohibited attempt to retry in part the issue of liability.
Judge Grady expressed concern over the possibility of a third trial being required in the event that on appeal after the upcoming, second trial, this court should determine that it was error to admit evidence in support of MCI’s present claim. Avoidance of that possibility was a reason for his suggestion of an appeal under § 1292(b). It is appropriate to consider whether, in the words of the statute, a decision on appeal “may materially advance the ultimate termination of the litigation.” In considering this factor, it occurs to us that the possibility of need for a third trial may be materially reduced by the use of a form of special verdict or of interrogatories so that any amount of damages dependent upon the loss of revenues from Execunet and Network Service will be separately stated.
We emphasize that our order today is not a decision on the merits. The parties remain free to raise and argue the admissibility of evidence of non-private line damages on appeal. Accordingly, IT IS ORDERED that AT & T’S PETITION FOR PERMISSION TO APPEAL UNDER SECTION 1292(b) OR, IN THE ALTERNATIVE, ITS MOTION TO CONSTRUE THE COURT’S PRIOR MANDATE, is denied without prejudice to further argument on the merits.