Runway
Nice theory, except that full service airlines are sometimes lower cost than locos.
Recent examples in my experience include BA/easyJet (Athens), Alitalita/Ryanair (Pisa) and bmi/Ryanair (Venice.)
The BA fare was booked 4 weeks in advance the Alitalia 3 and the bmi 7 months.
Sometimes the locos are the best deal, but it's a non sequitur and needs checking out, before deciding what service provisions you will accept.