Nonstop flight route between Fort Sill, Oklahoma, United States and Saint-Léonard, New Brunswick, Canada:
Departure Airport:

Arrival Airport:

Distance from FSI to YSL:
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- About this route
- FSI Airport Information
- YSL Airport Information
- Facts about FSI
- Facts about YSL
- Map of Nearest Airports to FSI
- List of Nearest Airports to FSI
- Map of Furthest Airports from FSI
- List of Furthest Airports from FSI
- Map of Nearest Airports to YSL
- List of Nearest Airports to YSL
- Map of Furthest Airports from YSL
- List of Furthest Airports from YSL
About this route:
A direct, nonstop flight between Henry Post Army Airfield (FSI), Fort Sill, Oklahoma, United States and Saint-Léonard Aerodrome (YSL), Saint-Léonard, New Brunswick, Canada would travel a Great Circle distance of 1,799 miles (or 2,895 kilometers).
A Great Circle is the shortest distance between 2 points on a sphere. Because most world maps are flat (but the Earth is round), the route of the shortest distance between 2 points on the Earth will often appear curved when viewed on a flat map, especially for long distances. If you were to simply draw a straight line on a flat map and measure a very long distance, it would likely be much further than if you were to lay a string between those two points on a globe. Because of the relatively short distance between Henry Post Army Airfield and Saint-Léonard Aerodrome, the route shown on this map most likely still appears to be a straight line.
Departure Airport Information:
IATA / ICAO Codes: | FSI / KFSI |
Airport Name: | Henry Post Army Airfield |
Location: | Fort Sill, Oklahoma, United States |
GPS Coordinates: | 34°38'58"N by 98°24'7"W |
Operator/Owner: | U.S. Army ATCA-ASO |
Airport Type: | Military |
Elevation: | 1189 feet (362 meters) |
# of Runways: | 1 |
View all routes: | Routes from FSI |
More Information: | FSI Maps & Info |
Arrival Airport Information:
IATA / ICAO Codes: | YSL / CYSL |
Airport Name: | Saint-Léonard Aerodrome |
Location: | Saint-Léonard, New Brunswick, Canada |
GPS Coordinates: | 47°9'25"N by 67°50'11"W |
Operator/Owner: | City of Edmundston |
Airport Type: | Public |
Elevation: | 794 feet (242 meters) |
# of Runways: | 1 |
View all routes: | Routes from YSL |
More Information: | YSL Maps & Info |
Facts about Henry Post Army Airfield (FSI):
- Henry Post Army Airfield (FSI) currently has only 1 runway.
- In 1940 the Artillery decided that the Air Corps had outgrown such mundane chores as artillery spotting, and it was decided that it would take care of itself with its own observation aircraft.
- By the late 1920s, the World War I tarpaper buildings were rotting and turning into fire hazards.
- The Fort Sill Army Radar Approach Control is the Army's Second busiest Air Traffic Control Facility, providing Radar Approach Control service to Henry Post Army Air Field, Lawton/Fort Sill Regional Airport, Duncan/Haliburton Airport and many smaller airports in the area.
- The first Army aviation at Fort Sill began on 26 July 1915 when eight Curtiss JN-3 airplanes of the 1st Aero Squadron arrived from Rockwell Field, California.
- The furthest airport from Henry Post Army Airfield (FSI) is Sir Gaëtan Duval Airport (RRG), which is located 10,920 miles (17,575 kilometers) away in Rodrigues Island, Mauritius.
- The closest airport to Henry Post Army Airfield (FSI) is Lawton–Fort Sill Regional Airport (LAW), which is located only 6 miles (9 kilometers) S of FSI.
- Post Field served as a base for flight training for the Air Service.
Facts about Saint-Léonard Aerodrome (YSL):
- The furthest airport from Saint-Léonard Aerodrome (YSL) is Albany Airport (ALH), which is located 11,544 miles (18,578 kilometers) away in Albany, Western Australia, Australia.
- The closest airport to Saint-Léonard Aerodrome (YSL) is Loring International Airport (LIZ), which is located only 14 miles (23 kilometers) S of YSL.
- Because of Saint-Léonard Aerodrome's relatively low elevation of 794 feet, planes can take off or land at Saint-Léonard Aerodrome at a lower air speed than at airports located at a higher elevation. This is because the air density is higher closer to sea level than it would otherwise be at higher elevations.
- Saint-Léonard Aerodrome (YSL) currently has only 1 runway.