Henry Post Army Air Field (KFSI/FSI)

Henry Post Army Air Field (KFSI) is a medium airport in Fort Sill, OK. Pilots and dispatchers reference it by ICAO code KFSI or IATA code FSI. It sits in North America.

Henry Post Army Air Field is a regional airport primarily serving general aviation, charter, and corporate flight departments. The 5,002-foot runway means it is well-suited as a dedicated bizjet field, free from airline scheduling pressure.

The longest runway measures 5,002 ft (1,525 m), a light-jet-class field. Representative aircraft that operate comfortably here include the Phenom 300, Citation CJ4, and Learjet 75. In practice this limits operations to light jets, turboprops, and short-field-capable aircraft.

Henry Post Army Air Field lies at 1,189 ft elevation.

Local operations run on America/Chicago. Without scheduled airline traffic, the field tends to be quieter and more flexible for charter and corporate operations — a useful characteristic for early morning, late night, or short-notice flights that would be impractical at a hub.

SkyAccess inventory for KFSI updates continuously as operators publish new empty legs and one-way repositioning trips. Pricing on each leg is available with a free account, and an inventory alert will email you the moment a leg appears on the route you care about.

Regional fields like KFSI are a meaningful share of US private aviation — closer to the trip's actual origin or destination than the nearest major hub, with shorter ramp-to-cabin times that are the main reason owners and brokers prefer them.

Henry Post Army Airfield is a military use airport located at Fort Sill in Comanche County, Oklahoma, United States. This military airport is owned by United States Army. Established as Post Field in 1917, it was one of thirty-two Air Service training camps established after the United States entry into World War I in April 1917.