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
Last month Chief Justice gave the commencement speech at Cardigan
The following was published in Dealerscope Magazine in December 2010:
Why the Distinction Matters For decades, language was seen as