Here is my list:

A = Affluent (to be able to afford this discounted First Class fare)
B = Buffoon (to pay almost Full Fare Economy)
C = Corporate (They have to be on their company’s money to afford Full Fare Business Class)
D = Determined (They must be determined to get into Business Class, so they will pay this discounted fare)
E = Exasperated (to always be stuck on TED)
F = Fortunate (to be able to afford Full Fare First Class)
G = Giftee (They got a sweet Travel Industry Economy Class fare)
H = Hostage (This is the minimum Economy Class fare for international mileage upgrades)
I = Impressed (that they got a Business Class Upgrade from Economy)
K = Keen (to take advantage of these seasonal Economy Promotional fares)
L = Lucky (to get this deeply discounted, but rare, fare)
M = Monied (to be able to pay this almost Full Fare Economy)
N = Necessary (You only blow 25K for an Economy award when you have too)
O = Optimistic (They’d have to be to think they would get a Business Class award ticket)
P = Prosperous (since only they can afford this p.s. First Class fare)
Q = Quack (to pay so much for a Discount Economy fare with moderate restrictions)
R = Relaxed (as they would be on a First Class award ticket)
S = Stingy (to grab this real lowball Economy fare with lot of restrictions)
T = Thrifty (to pay a little more for this heavily discounted Economy fare)
U = Unfortunate (to pay the unrestricted TED fare and not have a shot at an upgrade)
V = Value-oriented (to get this discounted Economy fare with a lot of restrictions)
W = Wise (to use a SWU with this deeply discounted Economy fare)
X = Xenophobic (since they don’t want to be near the “riff raff” in Economy, so they went with a First Class upgrade)
Y = Yahoo (to pay for this unrestricted Economy class fare)
Z = Zaftig (someone who is “pleasingly plump” would appreciate this deeply discounted Business Class fare)