I would recommend KLAX for definite, I know Southwest operate at KLAS, KLAX and KORD but not KJFK
I am looking at buying at least 1 airport along with GSX. I am going to use the airport with the NGX, mostly Southwest and United ops. Which airport is best suited for these airlines route structure.
Does it really matter? Microsoft gave us fictional airlines that fly nowhere, if someone wants to fly Southwest into ORD instead of MDW, more power to him.