EAA Arlington 2007 A-1 or AD?

[Lynn Coffelt]

[Bob Harrington]

[Scubabix]

Both, prior to 1962, the individual US services had their own designations
systems. This led to confusion, so they developed a unified system. Prior
to the change, this aircraft the AD-4NA and after it was the A-1D. If
you're interested in other changes, check out
http://www.designation-systems.net/usmilav/1962redesignations.html

Rob

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