Historically, the UK, Spain, France, Italy and Germany have had problems at various times with domestic terrorism. We had the IRA and INLA, though they've more or less gone away as terrorists (there's some evidence that they have morphed into "ordinary" organised crime outfits); Spain has had ETA (Basque separatists); Itally had the Brigadi Rossi; Germany had Baader Meinhof; and France had some problems with Corsican separatists. However from memory (which may be faulty) none of these groups actively targeted airports. The problems in France, Germany and Italy were mostly focused on bombs in railway stations and on kidnapping and murdering politicians. Here in the UK, most targets were civilian social places such as pubs and clubs, or economic targets such as the City. I can't remember what airport security was like in European airports before the rise of Islamic terrorism, but the UK has had heightened airport security since the 1970s in order to deter Irish terrorists from targetting airports.
