The Houston airport system is the operatateing agency for the three major airports in Houston, Texas. It is the 4th Largest airport system in the Unite States. the properies include George Bush Intercontinental Airport, William P. Hobby Airport, and Ellington Field. At one time, It at one time included Houston Central Business District Heliport, but that facility is currently closed, yet is still maintains an IATA code (JDX)