<h1>Flight attendants union defies return-to-work order, challenges constitutionality while airline extends agreement and resumes limited flights</h1> A nationwide carrier's flight attendants union continues a strike despite a federal minister referring the dispute to the industrial relations board and the board ordering a return to work, with the union announcing it will defy the order and intends to challenge its constitutionality. The carrier has extended the existing collective agreement pending binding arbitration and announced phased resumption of flights with cancellations and rebooking/refund options for passengers. The standoff raises issues about statutory back-to-work powers, limits on bargaining leverage, potential judicial review of government intervention, and the practical remedies and remedies available to affected travelers and the employer during protracted arbitration.