The catchment argument is very flawed. A short journey to the airport will influence, but price and availability will prevail. Yorkshire people will happily travel to BHX, NCL, LPL, EMA & MAN if the price is right, and chosen flight destination is available on their preferred date of departure. If the three airlines providing the destinations and availability at LBA chose to move to DSA, LBA would have less passengers than DSA. Airport incentives to the airlines will dictate which will sustain existing services or promote further growth.