will eAAsy sabre let you book any no-frills airline? Southwest, etc? I haven't found a way other than their website to book.

Seriously, Ryanair is even a step below Southwest. Although I have never been on them, supposedly soft drinks are available at a price, and they don't serve coffee (apparently serving coffee requires 11 different SKUs (stock keeping units) that would be used for nothing else. (coffee in filter bags, hot cups, stirrers, sugar, fake cream, etc etc etc) Read this in Airways magazine.