Originally Posted by
MikeMpls
You'll get away with it on Delta once, twice, .... Eventually you will find your miles confiscated and/or your credit card charged for the fare differentials (with or without your authorization).
Do you actually know of this happening? I cannot recall something like that ever being reported here. Granted I agree this isn't something people should frequently engage in, I just cannot recall hearing of an instance where Delta caught it after the fact and took action.