If I book a ticket for a flight on chol hamoed pesach, do I have to check my assigned seat for chametz?
When you rent a hotel room you do, so why should this be different?
(as opposed to say a train where you just gain entry rights but don’t have rights to any specific spot)
Here if you come on board and someone is in your seat you can ask them to vacate it. So it’s really yours for the duration of the flight. So why don’t you need to be bodek it?
Or do you?