opinion: Per Curiam.
  The petition for rehearing is denied. However, we think we should make clear the basis upon which our per curiam order affirmed the judgment of the District Court. 371 U. S. 223. The District Court dismissed appellants’ action to set aside an order of the Interstate Commerce Commission on two grounds: (1) that the appellants lacked standing to challenge the Commission’s order in the District Court; (2) that the appellants’ challenge to the Commission’s order was without merit. Our per curiam order affirmed the District Court’s judgment insofar as it upheld the validity of the Commission’s order on the merits. We disagreed that appellants lacked standing to challenge the Commission’s order in the District Court. The appellants are associations of motor carriers, authorized under 49 U. S. C. § 5b, and perform significant functions in the administration of the Interstate Commerce Act, including the representation of member carriers in proceedings before the Commission. Since individual member carriers of appellants will be aggrieved by the Commission’s order, and since appellants are proper representatives of the interests of their members, appellants have standing to challenge the validity of the Commission’s order in the District Court. See Administrative Procedure Act, 5 U. S. C. § 1009 (a); FCC v. Sanders Bros. Radio Station, 309 U. S. 470; NAACP v. Alabama ex rel. Patterson, 357 U. S. 449, 459.
  Mr. Justice Harlan concurs in the denial of the petition for rehearing and in the affirmance of the judgment of the District Court insofar as that judgment refused to set aside the order of the Interstate Commerce Commission. He believes, however, that the question of “standing” should not be decided without plenary consideration.
  Mr. Justice Stewart would grant the petition for rehearing.
choices: comity: civil rights comity: criminal procedure comity: First Amendment comity: habeas corpus comity: military comity: obscenity comity: privacy comity: miscellaneous comity primarily removal cases, civil procedure (cf. comity, criminal and First Amendment); deference to foreign judicial tribunals assessment of costs or damages: as part of a court order Federal Rules of Civil Procedure including Supreme Court Rules, application of the Federal Rules of Evidence, Federal Rules of Appellate Procedure in civil litigation, Circuit Court Rules, and state rules and admiralty rules judicial review of administrative agency's or administrative official's actions and procedures mootness (cf. standing to sue: live dispute) venue no merits: writ improvidently granted no merits: dismissed or affirmed for want of a substantial or properly presented federal question, or a nonsuit no merits: dismissed or affirmed for want of jurisdiction (cf. judicial administration: Supreme Court jurisdiction or authority on appeal from federal district courts or courts of appeals) no merits: adequate non-federal grounds for decision no merits: remand to determine basis of state or federal court decision (cf. judicial administration: state law) no merits: miscellaneous standing to sue: adversary parties standing to sue: direct injury standing to sue: legal injury standing to sue: personal injury standing to sue: justiciable question standing to sue: live dispute standing to sue: parens patriae standing standing to sue: statutory standing standing to sue: private or implied cause of action standing to sue: taxpayer's suit standing to sue: miscellaneous judicial administration: jurisdiction or authority of federal district courts or territorial courts judicial administration: jurisdiction or authority of federal courts of appeals judicial administration: Supreme Court jurisdiction or authority on appeal or writ of error, from federal district courts or courts of appeals (cf. 753) judicial administration: Supreme Court jurisdiction or authority on appeal or writ of error, from highest state court judicial administration: jurisdiction or authority of the Court of Claims judicial administration: Supreme Court's original jurisdiction judicial administration: review of non-final order judicial administration: change in state law (cf. no merits: remand to determine basis of state court decision) judicial administration: federal question (cf. no merits: dismissed for want of a substantial or properly presented federal question) judicial administration: ancillary or pendent jurisdiction judicial administration: extraordinary relief (e.g., mandamus, injunction) judicial administration: certification (cf. objection to reason for denial of certiorari or appeal) judicial administration: resolution of circuit conflict, or conflict between or among other courts judicial administration: objection to reason for denial of certiorari or appeal judicial administration: collateral estoppel or res judicata judicial administration: interpleader judicial administration: untimely filing judicial administration: Act of State doctrine judicial administration: miscellaneous Supreme Court's certiorari, writ of error, or appeals jurisdiction miscellaneous judicial power, especially diversity jurisdiction