A United Airlines passenger complains about “the worst flying experience” ever after they were told they would have to gate check a bag that didn’t fit in the sizer, even though they’ve successfully flown with it in the past. Their bag almost fit but was a little too large because of the wheels.
The passenger refused to check the bag and a supervisor allowed them to bring it on board anyway. Seems like a great flight to me, but one that flags a common misunderstanding about air travel. You might not be so lucky!