When I lived in europe, RyanAir made most of it's money in the terminal. This is why every RyanAir terminal has a maze like exit from security (ikea-esque) before you get to the actual terminal.

The RyanAir CEO was even quoted that he expected some tickets to be come "zero-fare" Link: https://www.theguardian.com/business/2016/nov/22/ryanair-fli...

The point stands, airlines don't make money on flights. Flights are loss leaders.