Originally Posted by
anon2k2
The only thing I can think of is to call DL and ask to upfare to V or X or whatever the next available bucket is. In the past that worked for me when my work purchased a T fare and I wanted an M so I could do an overseas mileage upgrade.
That works to go from one Economy bucket to another (or to buy up to F), but neither of those are possible with Basic Economy tickets. No changes permitted whatsoever.