ModelC/N The US Army upgraded the AH-1G (and its modernization AH-1Q and AH-1R ) with a three step program called AH-1S. - Production AH-1S ( AH-1S Prod ) : 100 new built in 1977/78 with a seven-plane semiflat crew canopy and TOW missiles. Redesignated AH-1P - AH-1S Upgunned : 98 new built in 1978/79 equipped with the Enhanced Cobra Armament System (ECAS). Redesignated AH-1E - AH-1S Modernized : 140 new built in 1979/81 and 387 conv from AH-1G/Q/R. Redesignated AH-1F AH-1S Cobra News BLR FastFin System for the AH-1 Cobra 05-Oct-15 - BLR Aerospace is flight testing the FastFin Tail Rotor Enhancement and Stability System on the AH-1 Cobra attack helicopter List of Operators of AH-1S Cobra Years Model Org 1967/99 209 AH-1 Cobra US Army Aviation 1974/14 209 AH-1 Cobra Heil Ha'Avir 1984- Pakistan Army Aviation 1988- Daehanminguk Yuk-gun 1990- 209 AH-1 Cobra Royal Thai Army 2003- 209 AH-1 Cobra US Department of Agriculture 209 AH-1 Cobra BLR Aerospace Global Distribution of AH-1S Cobra 47ah-1s
US Army Aviation 
Heil Ha'Avir 
Pakistan Army Aviation 
Daehanminguk Yuk-gun 
Royal Thai Army 