Ryanair used to have a reputation for using obscure airports, but they have changed a lot and often fly into the hubs as well. With both you need to check very carefully the airports used today (could be the "main" airport but could also be something 100km away), the schedule, and the baggage/seat policies that are currently in place. The rules have changed several times since the airlines began operating, and a mistake could cost a lot (relative to the price of the seat)!