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
Advice for battling Zoom fatigue from business psychologist Stuart Duff,
For many tech categories, new models were historically announced at
