"Roe v. Wade proceeded before a three-judge district court empaneled pursuant to 28 U.S.C. § 2281. See 28 U.S.C. § 2281 (1970); 28 U.S.C. § 2284 (1970) (controlling the composition and procedure of three-judge district courts). Before its repeal,2 § 2281 required a three-judge district court to hear and determine cases involving injunctions against the enforcement of state statutes based on allegations of unconstitutionality. See Corpus v. Estelle, 551 F.2d 68, 70 (5th Cir. 1977). McCorvey asserts that the single district court judge, who ruled on her Rule 60(b) motion, acted without authority. We disagree. Although the original action was tried by a three-judge district court, the Rule 60(b) motion filed by McCorvey in 2003 was not properly a matter for a three-judge court. In United States v. Louisiana, 9 F.3d 1159, 1171 (5th Cir. 1993), this court ruled, in another action determined under § 2281 by a three-judge court, that a single district court judge, acting alone after the repeal of § 2281, could properly entertain and decide subsequent modified remedial orders. The instant context is no different: A single district court judge can decide threshold questions relating to McCorvey's Rule 60(b) motion even though the underlying judgment was originally tried by a three-judge court under the former § 2281. See, e.g., Bond v. White, 508 F.2d 1397, 1400-01 (5th Cir. 1975). McCorvey argues that the district court abused its discretion in rejecting her Rule 60(b) motion for relief from judgment as untimely. A question necessarily antecedent to McCorvey's substantive claim, however, is whether she has presented a justiciable case or controversy pursuant to Article III of the Constitution. We are under an independent obligation to examine this jurisdictional question."