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
If there was any doubt about whether China is worried
“Hiring somebody and training them takes longer than building an
For many tech categories, new models were historically announced at