That is something I have been trying to figure out for a while... what are all of the 'all airport' booking codes in general use on reservation systems? Most of us know WAS, LON, PAR, CHI and NYC, but do codes also exist for Los Angeles area, San Francisco area, Miami area, etc. If you know, please post exactly which airports are covered... it seems sometimes WAS covers only IAD and DCA, and sometimes also includes BWI.