Situated in East Elmhurst, Queens, within New York City, LaGuardia Airport (LGA) is a bustling hub primarily serving domestic flights with limited international destinations. By passenger volume, it ranks as the third-busiest airport in the New York metropolitan area and the 19th-busiest in the United States. LaGuardia Airport has four terminals, each serving specific airlines and destinations. The Marine Air Terminal, or Terminal A, is a key part of this system. Lets take a closer look at five things to know about the Marine Air Terminal at LaGuardia Airport, New York City.