THIRUVANANTHAPURAM: The Union Government decision to allot the slots vacated by the grounded Jet Airways to other airlines has proved costly for the state as no major airlines have come forward to take up the slots vacated by the defunct airline. Further, as if this was not enough, some of the other airlines which received the slots of Jet Airways from metro cities have withdrawn the aircraft from Kerala in order to cash in on the more economically viable routes from there.