I'm curious... just how would this constitute being "ripped"?
Were you not happy with the fare you intended to pay
at the time you found it?
I avoid the problem by not looking at fares again after buying!

... but fares go down (sometimes) as well as up (usually)..
If the fare goes
up after your purchase would you countenance the airline asking you for more money? No? Then why this idea that something is owed if it goes down?
I find that quite curious... but then I am a past master at making major purchases just BEFORE price drops!!!
