What jurisdiction does the Court have over a motion to quash a subpoena?

Our jurisdiction usually is limited to appeals from final judgments. See 28 U.S.C. 1291. A final judgment is a judgment that effectively ends the litigation such that there is nothing left to decide. An order disposing of a motion to quash a grand jury subpoena generally is not such a final judgment. See United States v. Punn , 737 F.3d 1, 5 (2d Cir. 2013) ; United States v. Nixon , 418 U.S. 683, 690-91, 94 S.Ct. 3090, 41 L.Ed.2d 1039 (1974). There is an exception to the final judgment rule, however, when the order in question meets the requirements of the collateral order doctrine. Under this exception, an appellate court has jurisdiction over a non-final judgment "if such order (1) conclusively determined the disputed question; (2) resolved an important question completely separate from the merits of the action; and (3) was effectively unreviewable on appeal from a final judgment. " In re Air Crash at Belle Harbor , 490 F.3d 99, 109 (2d Cir. 2007) (citations omitted).