What no one seems to have noticed is that both Glasgow and Edinburgh are almost full. Today Edinburgh is permitting executive jets arriving for the Scotland - France Rugby only to unload passengers and then go somewhere else because they do not have space for them. There is a NOTAM out to that effect. With passenger traffic continuing to grow it must be highly likely that the lower costs at Prestwick will attract either some new business or some diversion of business from EDI or GLA. Ryanair is a case in point - they would appear to attract passengers from across central Scotland irrespective of which airport they use.