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
Here’s my crack at estimating the number of screens in
Gartner recently suggested: Unemployment, now at about 8%, will get