Why should I have to be forced to pay more for sitting seats just because I have a disability? What if all the sitting seats are fully booked or the plane has no sitting seats for passengers? It’s like intentionally designing a shop with several tall steps at the entrance that would make it impossible for wheelchair users to enter, and the wheelchair users have to pay each time they shop there to have a ramp extended at the entrance so they can enter. It’s an example of ablest design.