If you type in a city name + airport + wiki it lists every airline that fly's out of the airport.
So for example this link lists all airlines that fly to/from Buenos Aires (EZE)
http://en.wikipedia.org/wiki/Ministro_Pi...al_Airport
So for example this link lists all airlines that fly to/from Buenos Aires (EZE)
http://en.wikipedia.org/wiki/Ministro_Pi...al_Airport