Aircraft are part of GTA's content, and airports are how players get to them. We collect the state of airports around the map here.
The Vice City airport
The large airport - Miami International stand-in. Detailed on the Vice City airport page. Has several runways, terminals/aprons, and would plausibly serve as the origin for the larger aircraft.
Smaller regional airports
Plausible. Florida has several regional airports, and Leonida probably does too. None confirmed in trailer material at the time of writing.
Minor airfields would likely store smaller aircraft such as private planes and helicopters. Some may be used for side content like air races/smuggling.