What happens if I carry my bags on-board, and there is no space? You’ve made it to the airport, your flight is set for an on-time departure, and you’ve started the boarding process - only you’re in the back of a long line of fellow passengers, and by the time you get on board, there is no space left in any of the overhead bins! Well what happens in that case is the flight attendants take your bag into the cockpit, where the pilot gets first dibs on your stuff...ok, what really happens is that they take your bag off the plane and check it in. So now you have to go to baggage claim when you arrive at your destination to pick it up at the baggage carousel. No big deal, right?