Originally Posted by
AA_EXP09
But M fares are generally bought for flexibility, not just SWU use.
If this is true, then DL should offer an inflexible fare on which SWUs can be applied. It could be more expensive or have more restrictions than existing fares, so that there is some addition to the fare for the privilege of upgrading. Or DL could allow upgrades into BE from H fares with a copay.