If the airplanes are completely full (which, despite all attempts by Ryanair to scare away their customers, they apparently still are). But this fails to accoun

If the airplanes are completely full (which, despite all attempts by Ryanair to scare away their customers, they apparently still are). But this fails to account for "induced demand": if flights would be more expensive or less convenient, people wouldn't fly on weekend trips/holidays, visiting relatives in faraway countries etc. as frequently as they do now.