There are several reasons given in the movie:
Lincoln International Airport is the fictional Chicago-area airport depicted in the 1970 movie "Airport".
LINCOLN INTERNATIONAL
Manchester airport is the closest airport to Lincoln Illinois
Airport
There is no longer a functioning airport in Jerusalem. But there are flights from Ben-Gurion International Airport (near Tel Aviv) to Cairo.
There are 29 Civil airports & 9 international airports:Cairo international airport,Alexandria International Airport,El Arish International Airport,St. Catherine International Airport,Taba International Airport,Mubarak International Airport,Sharm el-Sheikh International Airport,Luxor International Airport &Hurghada International Airport.
The International Airport in Lithuania areKaunas International AirportPalanga International AirportŠiauliai International Airport (CIV/MIL)Vilnius International Airport
The airport code for Calicut International Airport is CCJ.
The airport code for Tocumen International Airport is PTY.
The airport code for Tehran Imam Khomeini International Airport is IKA.
The airport code for Bengaluru International Airport is BLR.
The airport code for Larnaca International Airport is LCA.