In order to book an upgradable fare on United you have to buy a ticket in fare class W or higher. Here are the fare classes above W.
V
Q
H
U
E
M
B
Y
Only airlines could convolute something so simple as the ordering of the alphabet.
Related
When tariffs disrupt global trade, retailers face a critical test:
Is it getting easier or more difficult to monetize content?
Most think of a second screen experience as one narrowly