y就是全价票 只不过所谓全价票也是分了几个class的
所以你才看到b和m比y贵
参考dl的class codes:
DELTA FARE CLASS MFare class M is a revenue fare/booking class of service that is marketed as Main Cabin on Delta Air Lines mainline and code share flights. This fare class is considered a
full fare ticket that is eligible for complimentary upgrades.
DELTA FARE CLASS B
Fare class B is a revenue fare/booking class of service that is marketed as Main Cabin on Delta Air Lines mainline and code share flights. This fare class is considered a
full fare ticket that is eligible for complimentary upgrades.
DELTA FARE CLASS Y
Fare class Y is a revenue fare/booking class of service that is marketed as Main Cabin on Delta Air Lines mainline and code share flights. This fare class is considered a
full fare ticket that is eligible for complimentary upgrades.