In this proceeding, we conclude that the district court’s abstention-based remand order is not immediately appealable and that mandamus is not an appropriate alternative. Because this jurisdictional determination involves an issue on which the circuits are somewhat less than uniform, we take some pains to elucidate our rationale. We do not, however, reach the merits and, 'accordingly, leave a veritable hothouse of efflorescent questions to be plucked at another time and in another forum.
I. BACKGROUND
The controversy that is before us finds its genesis in a beguilingly simple question: “Who insures the insurers?” The question *859 arises in connection with American Mutual Liability Insurance Company (AMLICO), a Massachusetts-based firm, which entered into a series of reinsurance contracts over a period of more than three decades. When AMLICO began paying out huge sums to satisfy asbestos-related claims at the tail end of this period, its efforts to secure reimbursement from reinsurers bore no fruit. Unassisted, AMLICO could not stanch the financial hemorrhaging and sought protection under state insolvency laws. The Massachusetts Supreme Judicial Court ordered the firm liquidated, and, in due course, appointed respondent-appellee Kay Doughty, the Commonwealth’s Commissioner of Insurance, as permanent receiver.
Doughty filed suit in state court to recover an estimated $15,000,000 in overdue reinsurance indemnities, as well as treble damages under the Massachusetts trade practices statute. See Mass.Gen.Laws ch. 93A, §§ 10, 11 (1984). She named as defendants a melange of entities alleged to have entered into reinsurance pacts, including the so-called London Market Companies and several underwriting syndicates at Lloyd’s, London (collectively, “the Reinsurers”). 1
The Reinsurers did not relish the chance to settle accounts in a court of law. Citing agreements contained in some (but far from all) of the reinsurance contracts, they formally requested that AMLICO submit its claims to arbitration. Doughty declined the invitation. She asserted, among other things, that the call for arbitration came too late; that the Reinsurers had waived the benefit of any agreements to arbitrate; and that, in any event, the dispute as a whole did not qualify as arbitrable. At that point, the Reinsurers invoked 9 U.S.C. § 205 (1988) 2 and removed Doughty’s suit to the United States District Court for the District of Massachusetts. Next, they filed motions to compel arbitration and, as an interim prophylactic, to stay proceedings pending the outcome of the arbi-tral process. Doughty objected to these motions and moved on sundry grounds for an order remanding the case to state court. The Reinsurers opposed this motion.
Concluding that principles of
Burford
abstention controlled,
see Burford v. Sun Oil Co.,
This proceeding ensued. In it, the Rein-surers wear two hats, appearing as both appellants and petitioners; they appeal from the remand order while simultaneously seeking a writ of mandamus aimed at recalling it. We consolidated these two initiatives for briefing, oral argument, and decision.
*860 II. THE APPEAL
We begin our inquiry into the appeal by addressing the question of appellate jurisdiction for, if no jurisdiction attaches, the appeal founders.
See In re Recticel Foam Corp.,
A. The Statutory Bar.
28 U.S.C. § 1447(d) provides that “[a]n order remanding a case to the State court from which it was removed is not reviewable on appeal or otherwise.” Although this statute prohibits appellate review of remand orders “whether erroneous or not and whether review is sought by appeal or by extraordinary writ,”
Thermtron Prods., Inc. v. Hermansdorfer,
This is such an instance. Despite the fact that Doughty articulated several reasons for remanding the case, many of which implicated section 1447(c), the district court shunted these asseverations to one side and instead remanded exclusively on the basis of
Burford
abstention. Because abstention, by definition, assumes the existence of subject matter jurisdiction in the abstaining court—after all, one must have (or, at least, presume the presence
of)
subject matter jurisdiction in order to decline the exercise of it—-section 1447(c) does not apply to an abstention-driven remand. See
Corcoran v. Ardra Ins. Co.,
B. Possible Sources of Appellate Jurisdiction.
Our determination that 28 U.S.C. § 1447(d) does not operate to bar appellate review merely removes the first hurdle blocking the jurisdictional path. To pass the next hurdle, the Reinsurers must demonstrate the existence and applicability of some affirmative authority conferring jurisdiction on the courts of appeals to review remand orders of the sort at issue here. The Rein-surers try to clear this hurdle from three different angles. They urge that the remand order is appealable under 28 U.S.C. § 1291 (1988) (conferring jurisdiction on the courts of appeals to review “final decisions of the district courts”), or, alternatively, as a collateral order,
see Cohen v. Beneficial Industrial Loan Corp.,
1. The Final Judgment Rule. In respect to the suggestion that the remand order is appealable as a final judgment, the sockdolager is that the Supreme Court has said exactly the opposite:
[Bjecause an order remanding a removed action does not represent a final judgment reviewable by appeal, the remedy in such a case is by mandamus to compel action, and not by writ of error to review what has been done.
*861
Thermtron,
The Reinsurers attempt to deflect the force of this blunt statement by suggesting that it should be regarded as dictum. They posit that, because the Thermtron Court found the remand order so egregious as to justify mandamus, no need to decide the availability of direct appellate review ever arose. In advancing this suggestion, the Reinsurers are whistling past the graveyard.
“Dictum” is a term that judges and lawyers use to describe comments relevant, but not essential, to the disposition of legal questions pending before a court.
See Kastigar v. United States,
Still using the final judgment rule as their stepping stone, the Reinsurers make a second effort to boost themselves over the hurdle—an effort hinging on the assumption that
Thermtron
did not survive the Court’s later decision in
Moses H. Cone Memorial Hosp. v. Mercury Constr. Corp.,
The slightly longer, but equally forceful, rebuttal is that there seem to be other good reasons counselling in favor of Thermtron’s continued vitality. In
Cone,
the Court held that a stay, issued in order to permit a related state case to proceed prior to the federal ease, could be appealed as a final order. But,
Cone
makes no reference to Thermtron’s holding vis-a-vis remand orders, a circumstance which strongly suggests that the Court viewed the rules pertaining to remands and to stays, respectively, as separate and distinct. Moreover, the Supreme Court has continued to rely on
Thermtron
in the
post-Cone
era.
See, e.g., Carnegie-Mellon Univ. v. Cohill,
Lastly, and relatedly,
Thermtron
and
Cone,
scrutinized side by side, highlight certain differences between remand orders and stay orders. Whereas stay orders ordinarily signal a determination that there are federal interests at stake, sufficient ultimately to justify a hearing in federal court, remands, by definition, embody a determination that the cognizable federal interests, if any, when compared to the cognizable state interests, are so lacking in weight that the federal court either does not have, or should not appropriately exercise, jurisdiction. A remanded case’s failure to pass a threshold test of this sort might possibly explain why a federal appeal as of right does not attach and the back-up remedy of mandamus is deemed adequate protection. Furthermore, remand orders typically involve a single ease that a federal court returns to the state tribunal whence it emanated. Consequently, the litigation continues to progress, albeit in a state rather than a federal forum. In that sense, there is neither a permanent disposition of the case nor a disruption of its progress. A stay, on the other hand, typically involves two separate proceedings, say, one in a state court and one in a federal court. When the federal tribunal stays the latter pending the outcome of the former in state court,
res judicata
principles make that decision effectively final as to certain aspects of the federal case.
See Cone,
2.
The Collateral Order Doctrine.
Next, the Reinsurers argue that the remand order, even if not a final judgment, may nonetheless be appealable under the collateral order doctrine. That doctrine carves out a “narrow exception to the normal application of the final judgment rule,”
Midland Asphalt Corp. v. United States,
Once outside the purview of 28 U.S.C. § 1447(d),
see supra
Part 11(A), there is no absolute rule either prohibiting or permitting immediate appellate review of remand-related orders under the
Cohen
rubric.
Compare, e.g., Karl Koch Erecting Co. v. New York Convention Ctr. Dev. Corp.,
*863
The remand order here at issue does not pass muster under
Cohen.
The salient legal question that stands separate and apart from the merits in this case—that is, the “collateral” issue—is whether the parties’ overall dispute should be resolved in arbitration. The district court’s ruling did not conclusively determine this issue. Instead, the district court’s order set to rest only the preliminary question of which court should resolve the collateral issue. In other words, the collateral issue remains an open matter—a matter that the state court must yet decide. We agree with the Second Circuit that, to come within the collateral order rule, a decree must definitively resolve the merits of the collateral issue, not merely determine which court will thereafter resolve it.
See Corcoran,
The Reinsurers attempt to subvert this conclusion by redefining the collateral issue. They suggest that the question is not whether the underlying dispute should be resolved in arbitration, but, rather, whether a federal or state court is the proper forum for determining the dispute’s arbitrability. We think this argument proves too much. Every remand order conclusively determines which court will thereafter determine the issues in controversy. Thus, appellants’ approach could easily expand
Cohen
beyond the isthmian confines that the Court envisioned,
see Cohen,
In all events, we conclude that, whatever way the collateral issue is defined, the remand order is not immediately appeal-able because it fails another element of the test.
Cohen
requires that the disputed issue represent “an important and unsettled question of controlling law, not merely a question of the proper exercise of the trial court’s discretion.”
Boreri v. Fiat S.p.A.,
*864
We hold, therefore, that an order to remand premised on
Burford
abstention is not immediately appealable under the
Cohen
rubric. In reaching this result, we find ourselves in agreement with the Second Circuit.
See Corcoran,
3. The Federal Arbitration Act. The Federal Arbitration Act is the last source of the Reinsurers’ effort to generate an adequate jurisdictional showing. 5 The Act provides, inter alia, that an appeal may be taken from an order refusing a stay pending arbitration or denying a motion to compel arbitration. See 9 U.S.C. § 16(a)(1)(A), (C) (Supp. V 1992). Here, the district court, after remanding the case, stated that it was denying appellants’ motions to compel arbitration and stay the litigation, without prejudice. The Reinsurers endeavor to appeal from these “denials.” We are unimpressed.
We think it is evident that the district court, having indicated its intention to remand the case to state court, added the “denied without prejudice” language merely as a way of flagging that it intended the arbitrability issue to be decided in a state court and that the federal court, in remanding, took no view of arbitrability. The district court’s remarks, then, did not deal with the merits of the arbitration question and were not arbitrability denials of the sort that the Federal Arbitration Act makes immediately appealable.
Compare Asset Allocation & Management Co. v. Western Employers Ins. Co.,
The Reinsurers cannot achieve a different result even if the district court acted with a more meddlesome intent. Once it remanded the case to a state forum, the district court lost jurisdiction over the case and, therefore, lacked the authority to issue substantive orders of the sort that the Rein-surers suggest were issued here.
See, e.g., In re La Providencia Dev. Corp.,
In the last analysis, whether or not we construe the district court’s remarks as rulings, the bottom line is unaffected: the denials have no legal effect aside from making clear the dimensions of the issues that the court proposed to leave unadjudicated.
4. Summary. To recapitulate, under the circumstances of this litigation, the district court’s remand order is not a final judgment; it is not an appealable collateral command; and its accouterments are not appealable under the Federal Arbitration Act. Because the Reinsurers have been wholly unable to demonstrate a cognizable hook on which appellate jurisdiction may be hung, their appeal must be dismissed for want of jurisdiction. 7
III. THE PETITION FOR MANDAMUS
Anticipating problems in topping the jurisdictional hurdles, the Reinsurers also seek to proceed by way of mandamus. They ask that we issue a writ requiring the district court to vacate the remand order, accept jurisdiction over the case, compel arbitration of a portion of the underlying dispute, and stay proceedings as to the remainder. We see no reason to honor the request.
Although federal appellate courts have power to issue prerogative writs that are “necessary or appropriate in aid of their ... jurisdiction ],” 28 U.S.C. § 1651(a) (1988), that power must be used stintingly and brought to bear only in extraordinary situations.
See Allied Chem. Corp. v. Daiflon, Inc.,
In the first place, “mandamus [generally] will not issue to control exercises of discretion.”
Recticel,
In the second place, we cannot say that the district court’s decision in this case represents a palpably erroneous application of
Burford
abstention law. Although the radius of permissible
Burford
abstention has shrunk in recent years,
see New Orleans Pub. Serv., Inc. v. City Council of New Orleans,
We note, too, that the record reveals several potential
non-Burford-based
reasons for remanding this ease which, on the surface, appear to possess merit. It is a prerequisite to mandamus relief that the ruling below be “palpably improper,”
LaBuy v. Howes Leather Co.,
Also, we descry no special risk of irreparable harm. The Reinsurers’ rhetoric does not change the fact that the remand order leaves the issue of arbitrability unresolved. The state court will decide that issue, and the Reinsurers will have rights to appeal within that system should they so elect. While the Reinsurers may prefer that a federal forum determine the result, they have offered no reason why the frustration of this preference is likely to cause irreparable harm.
Cf., e.g., Garcia,
There is an overriding consideration that touches upon all the above. A court that is asked to issue a writ of mandamus is itself invested with considerable discretion.
See Kerr v. United States District Court,
Further, the crux of the controversy involves the contested interpretation of con
*867
tract provisions presenting chiefly matters of state law. Claims have also been brought under Massachusetts unfair trade practice statute. The larger context in which the litigation is set concerns the business of insurance, which the McCarran-Ferguson Act, 15 U.S.C. § 1012 (1988), unequivocally declares to be a state-law preserve. The Commonwealth, through its Insurance Commissioner, is a real party in interest. In all, it likely understates the obvious to acknowledge that “state issues substantially predominate.”
United Mine Workers of America v. Gibbs,
We need go no further. It is apodictic that “[m]andamus cannot be allowed to become a handy substitute for an otherwise unavailable interlocutory appeal.”
Bushkin,
IV. CONCLUSION
To summarize, although the statutory bar, 28 U.S.C. § 1447(d), does not pertain, the Reinsurers cannot clear the other jurisdictional hurdles that dot the path to federal appellate relief. We lack jurisdiction over their appeal and we also lack a cognizable basis for issuing a prerogative writ.
The appeal is dismissed for want of appellate jurisdiction. The petition for issuance of a writ of mandamus is denied. Costs are to be taxed in favor of respondent-appellee.
Notes
. In labelling the London Market Companies and the Underwriters at Lloyd’s, collectively, as “the Reinsurers," we exclude for present purposes a number of domestic firms and certain other foreign-based insurance providers (e.g., English & American Insurance Co. and St. Helens' Insurance Co.) named as defendants in Doughty’s action. The appellation "London Market Companies” is itself a collective term describing a consortium of foreign-based insurance providers, including Excess Insurance Co.; General Reinsurance Co. (Amsterdam); General Reinsurance Syndicate; Anglo French Insurance Co. (as successor to Federation General Insurance Co.); British National Insurance Co.; Sovereign Marine & General Insurance Co.; Royal Scottish Insurance Co.; Swiss National Insurance Co.; Zurich Reinsurance (U.K.) (as successor to Ture-gum Insurance Co.); and Gan Minster Insurance Co. (as successor to Minster Insurance Co.). Finally, we note that the Lloyd's underwriting syndicates are identified in the notice of appeal and petition for mandamus only as "Derek Richard Wallis, for himself and those other Underwriters at Lloyd's, London.”
. This statute implements the Convention on the Recognition of Foreign Arbitral Awards (the "Convention”). It provides that, if "the subject matter of an action or proceeding pending in a State court relates to an arbitration agreement or award falling under the Convention, the defendant or the defendants may, at any time before the trial thereof, remove such action or proceeding.” Under 9 U.S.C. § 202, the arbitration agreements here at issue arguably come within the Convention's grasp because, if the agreements exist and remain in effect, at least one party to each such agreement is a foreign entity.
. On this issue, all roads lead to Rome. Were we to assume, favorably to appellants, that the challenged statement did not comprise part of the Court’s holding, we would nevertheless hew to it. Carefully considered language of the Supreme Court, even if technically dictum, generally must be treated as authoritative.
See United States v. Santana,
. While we are comfortable with the result in
McDermott,
given its facts, some of the language contained in the opinion is potentially mischievous. With respect, we think the court overgeneralized by failing to distinguish between cause and effect.
McDermott
properly found the district court’s remand order to be appealable under the collateral order doctrine, but this outcome is not dictated merely because the remand order had the
"effect
[of] allowpng] a state court to decide the question of arbitrability.”
McDermott,
. We need not consider whether the
Enelow-Ettelson
doctrine,
see Enelow v. New York Life Ins. Co.,
. The court’s power to issue such orders is derivative of, and implicit in, its power to remand.
. Inasmuch as we hold that there is no affirmative source conferring jurisdiction over the appeal essayed by the Reinsurers, we need not address any of Doughty's other challenges to this court’s appellate jurisdiction.
.We have, on infrequent occasions, relaxed these requirements and exercised our powers of “advisory mandamus” when matters of great public import are involved.
See In re Justices of the Supreme Court of Puerto Rico,
