it was mentioned on another thread in here that Murcia is primerily a military base, and 'opens' the airport to civilian traffic for a very limited amount of time each day. miss your arrival into Murcia by a matter of minutes, and you have to divert to Alicante (and then have to transfer all passengers too). Miss your departure out of Murcia, and you plane is effectively impounded until the airport next 'opens'.
thats what i was lead to believe, however i'm sure someone could clarify that it's true, or that i'm talking a load of 'tosh'......... lol