The Pet Fee IS Enforced..#1 TSA will notice you have a pet when you put it on x-ray when checking for tickets..#2 gate agent checks when boarding..#3 Flight Attendants have In-cabin pets on thier report..do you want to miss your flight because you didnt pay the fee you know is required..or have a red-coat meet a flight to have you pay?..you know you have to pay..so its not an option.@:-)