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
From CES 2026 straight to NRF 2026, one thing became
Apple surprised to the upside (though it really shouldn’t be