posted on Nov, 23 2020 @ 12:33 PM
For every decade since the 80s, I think it would be a safe bet that the Big 3 (+ others) produced each of following in some form or capacity, whether
in-house or soliticted:
1) Advanced Fighter Concept
2) Time Sensitive ISR Concept
3) Special Purpose Concepts
4) Tactical or Strategic Bomber Concept
Worst case, between those four types, that's at least 4 classified aircraft per decade.
Four decades removed from 1980, that's about 16 unique classified aircraft that could have been toyed with in the skies.
As Zaphod before, there really is a lot out there we have never, or may never see.