What should I do? (Please pick the answer that best describes the reasoning you would use.)
Give up on changing their behavior and continue to use US Airways as I would any other airline
1(20.0%)
Use the voucher, because it'll save me $100
1(20.0%)
Use the voucher, because $100 off means it will probably hurt US Airways' bottom line if I do
0(0.0%)
Don't use the voucher, because I can't be sure they won't still make money from my ticket
0(0.0%)
Don't use the voucher, because it would make US Airways think their behavior is acceptable
1(20.0%)
Don't use the voucher, because $100 is not reasonable compensation for a $600 loss
0(0.0%)
Write more letters to them
2(40.0%)
Other (explain in comments)
0(0.0%)
In other “news”: Nohari window Johari window. Note: I put the Nohari window first because I think it's more interesting, so do that one if you only do one.