Scheduling windows matter noticeably more than most tourists know. Business facts from recent years suggests that the optimum period of time to safe business class discounts to Europe is amongst 50 and 179 days prior to departure, with peak cost savings within the 129-working day mark. . 來自 Cambridge English https://businessflightshop.co.uk/blog/get-your-business-class-air-ticket-to-hawaii-for-a-perfect-beach-vacation/