Spirit Airlines Inc. v. Maizes

(1) Whether a party must overcome a higher burden to show that an arbitration agreement delegates to the arbitrator the power to decide the availability of class arbitration than to show that it delegates the power to decide the availability of bilateral arbitration; and (2) whether an arbitration agreement may be interpreted to delegate to the arbitrator the power to decide the availability of class arbitration if the agreement lacks an express statement making such a delegation, but instead merely requires the arbitration to be conducted under standard arbitration rules.