自从开始飞达美以来 并没有飞过一次亚欧这种跨洋线。请问大家 对于跨洋线，Delta One的升舱是统一check in以后开始排队clear嘛？我不用券也会出现在upgrade list上吧？Diamond 级别的话是出票也可以直接选Comfort +嘛？
谢谢
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International Delta One不能
Medallion Members and one travel companion are eligible for Unlimited Complimentary Upgrades to First Class and Delta Comfort+, as well as the domestic Delta One experience as part of your Medallion Benefits. Upgrades to First Class are available within most regions in the U.S., Canada, Mexico, Caribbean, Bermuda, Central America, and Northern South America. Upgrades to Delta Comfort+ are available within the U.S., Canada, Latin America/Caribbean, and Asia Pacific markets including China and Hong Kong.
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所以 国际航线上的D1不是现金票买的就是用了券的咯
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还有里程票。少数情况Op Up？
据说德尔塔姨只能升一等 
想起来comfort +在delta是单算一等的。 
（但comfort+貌似比贵司的e+还便宜不少）