could only be done with F50's under 20 tonnes MTOW. Apparently there are some around, but most seem to be over 20 tonnes, which for a few flights a day makes security incredibly expensive & that makes the whole idea of using a F50 not viable (it's crazy that a 50 seat Dash 8, that comes in just under 20 tonne MTOW does not need security, but an F50, that comes in just over 20 tonnes & carries same number of pax, needs security)