Norm G, I don't understand your comment. First flight of A-12 #121 was 4/26/62. First flight of the YF-12 (#6939 airframe number) was 3/13/64. The YF-12 was the fighter/interceptor version of the A-12/SR-71 series.
Fight, the X-15 was rocket powered and no, I don't consider it an airplane (although I did say "plane" in my original post). I think most aircraft fans make a distinction between air-breathers and rocket-powered craft.
Also, I posted a question about the Aurora several months ago to see if there was any credible evidence of Aurora flying operationally or otherwise. I found no credible evidence of Aurora flying operationally. According to the Skunks Works mailing list guys, they say no operational data coming out of either Desert Storm or the new terrorist war that would indicate intelligence or data from a high flying spy craft as was seen when the Blackbird was flying.
As far as the retirement of the Blackbird being "evidence" of Auroro, you don't have to look very far into the Blackbird community to see that the Blackbird was retired because the USAF no longer wanted it (there was no high level support within the USAF for the platform; the highest level guy was considered to be General Bond who was killed flying at Groom Lake several years ago).
Keep in mind that even the F-117 and B-2 programs were considered the highest classified programs of their time, that didn't prevent people from knowing the programs were real.
There is a good analysis of that whole subject at the FAS.org site.
Anyway, I thought it pretty interesting that Kelly Johnson's brainchild flew today 40 years ago and we haven't seen anything remotely approach it in performance since (excepting spaceplanes (X-15, shuttle).
Thanks,
Merlin