You simply forfeit the value of your ticket, which is worth $75 of air transportation on that flight and date you bought it for. Nonrefundable and subject to change fees and additional fare collection for any new flight. Obviously you would not pay a $200 change fee to move the $75 ticket to another flight and date unless it was urgent you fly on a new date. I am sure an agent at US will explain it as such, but to set you mind at ease give them a call. This type transactions is not unique to US so no bashing them for it. All apply the same principle and international change fees are even higher. WN
is the only airline that provides the cancel and flight credit for future use option. It is a definite plus that I've used many times. I've even had a ticket on WN
, purchased at a higher rate, reissued to a lower fare as a result of a sale fare and get a future flight credit for the difference. They're the only ones to do it and I definitely factor that in for personal travel because it is a win-win for me and it obviously is a big sales factor for WN
as well. But not to minimize, all the other airlines generate millions of dollars in additional revenue off change fee and additional fare collections. It boils down sometimes to "pick your battle."
watch what you want. you may get it.