The UEFA Cup Final will be held at Hampden Park on Wednesday 16th May 2007. As things stand its down to four foreign teams - Bremen / Sevilla / Osasuna / Espanyol.
Although the numbers attending may not be quite so high (though I suppose that depends on which two teams actually reach the final) this event has the potential to rival the 2002 Champions League Final which was also held in Glasgow.
I suspect GLA and PIK will be the main airports used. In 2002 I "think" the final was Real Madrid v Bayer Leverkusen (Germany). The Germans used Prestwick and the Spanish used GLA (more or less) and both airports were very busy.
Although it's early days.... if anyone has any aviation-related information associated with the event I would be keen to hear it.