Let's face it. There are cases where the airline is totally wrong. I have never been refused a carry-on. If they say anthing, I tell them it is designed to fit under the seat in fornt of me. My sister has been frequently forced to check in a bag, even though others are allowed on with much larger bags. She has a real small carry-on. I could see if all larger bags are not allowed, but this selective enforcement is ridiculosis.