Back in the late 1960s, when the whole, so-called, warbird movement started, a warbird was defined simply as a civilian owned aircraft of a type (mostly from the World War 2 period) once used by a military force.
In the beginning it generally referred to fighters and bombers, but was later changed to include trainers, transports and any other types (again, mostly from the World War 2 period) once used by a military force.
However, when jets and helicopters entered the movement, things changed again.
So nowadays, techanically, a 747, 737, DC-9, C-130 and hundreds of other types that have been used by a military force, but now operated by a civilian, can be called a warbird.
So, to answer the question as to . . , where to cut it off?
I'd say, when the government(s) finally make it impossible for private aircraft to fly.
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