Isn't that mostly through mobile stairs though? Airstairs are specifically the foldable stairs built into the plane, which enforce a stricter limit on the heigh

Isn't that mostly through mobile stairs though? Airstairs are specifically the foldable stairs built into the plane, which enforce a stricter limit on the height that the door can be from the ground. I'm sure Ryanair uses them to save on ground handling fees, but if you were designing a plane from scratch these days you wouldn't include them.