From another thread - "US Pre-Clearance - As mentioned by other contributors, EDI do appear to be pushing ahead with a genuine attempt to obtain US Pre-Clearance. S25 is the suggested start time if they succeed. Finance is in place for the application with detailed plans being drawn up for a redevelopment of the terminal to house the TSA area."
That'll be the end of any thoughts of a US of A's airlines comeback to GLA probably, centralisation it is then unless we get rid.