Mons Calpe(one of the Pillars of Hercules)

• "X" is the only airport where the runway actually intersects the express highway. 
• .In 2004 "X"handled 314,375 passengers and 380 tonnes of cargo. 
• Winston Churchill Avenue intersects the airport runway, and consequently has to be closed every time a plane lands or departs. 
• The History Channel programme Most Extreme Airports ranks it as the fifth most dangerous Airport in the world.
•  More interesting is that the British Airways has daily flights here

Id "X"

Answer (highlight to read) : Gibraltar International Airport