U.S. Air Force Installs ‘Delta Fins’ On C-21s To Counter Dutch Roll

Master Sgt. Jonathon Tolbert, with the 375th Operations Group, points out newly installed fins on the C-21A.
Credit: U.S. Air Force
The U.S. Air Force in late November announced the re-entry into service of the USAF’s first C-21A (Learjet 35A) transport with an aft-fuselage fin modification designed to improve directional stability. The Air Force said it ordered the Delta Fins modification after an undisclosed number of its twin...
Bill Carey

Bill covers business aviation and advanced air mobility for Aviation Week Network. A former newspaper reporter, he has also covered the airline industry, military aviation, commercial space and unmanned aircraft systems. He is the author of 'Enter The Drones, The FAA and UAVs in America,' published in 2016.

Subscription Required


U.S. Air Force Installs ‘Delta Fins’ On C-21s To Counter Dutch Roll is published in Aerospace Daily & Defense Report, an Aviation Week Intelligence Network (AWIN) Market Briefing and is included with your AWIN membership.

Already a member of AWIN or subscribe to Aerospace Daily & Defense Report through your company? Login with your existing email and password.

Not a member?  Learn how you can access the market intelligence and data you need to stay abreast of what's happening in the aerospace and defense community.