United Airlines vai introduzir categorias de tarifas por nível para cabines premium https://www.reuters.com/business/united-airlines-introduce-tiered-fare-categories-premium-cabins-2026-04-03/?taid=69d016721646ae00010c042c https://www.reuters.com/business/united-airlines-introduce-tiered-fare-categories-premium-cabins-2026-04-03/?taid=69d016721646ae00010c042c