Conroe-North Houston Regional Airport — Houston, United States

Conroe-North Houston Regional Airport, coded CXO, absorbs a significant share of general aviation and corporate jet traffic that might otherwise crowd Houston's larger commercial airports to the south. Positioned near Lake Conroe in Montgomery County, the field has grown alongside rapid suburban expansion north of Houston, adding businesses, flight schools, and hangar development in step with the region's population boom. Rather than scheduled passenger airline routes, CXO's runways handle private aircraft, charter operators, and flight training activity, making it a quietly essential piece of infrastructure for a metro area whose main airports focus on high-volume commercial traffic instead.