Greybull is a town in central Big Horn County, Wyoming, United States.

Public education in the town of Greybull is provided by Big Horn County School District #3.

[10] Intercity bus service to the town is provided by Express Arrow.

[11] The town is served by the nearby South Big Horn County Airport (IATA: GEY, ICAO: KGEY, FAA LID: GEY) used for General Aviation operations but which was the base for air tankers operating in the forest firefighting role, for many years flown by the local firm.

Christler-Avery Aviation was founded by Mel Christler and Morris Avery in 1951 offering aerial spraying operating B-18 Bolo, B-25 Mitchell, Northrop Delta aircraft.

Mel Christler transferred to Thermopolis in 1961 and sold his share in the company to Avery.

The airline operated Bell 47, Cessna 195, Consolidated PB4Y-2 Privateer and at Avery's death was sold to the pilots.

The airline operated: Boeing C-97 Stratofreighter, Consolidated PB4Y-2 Privateer, Fairchild C-82 Packet, Fairchild C-119 Flying Boxcar, Lockheed C-130 Hercules and Lockheed P-2 Neptune all in the aerial firefighting role.

The airline declared bankrupt in 2005 (20 years ago) (2005) after a series of fatal accidents.