The last SR-71 Blackbird ever built has disappeared from its outdoor display at Edwards AFB.

NASA 844 — the final Blackbird to fly (October 1999) — was moved into a hangar earlier this year.

NASA won't say where it is or why.

NASA Administrator Isaacman recently showed a dark aircraft silhouette resembling an SR-71 while talking about getting "back in the business of flying high and fast again."

Asked if it was a Blackbird, he replied: "You sure that's a Blackbird?" NASA says it has "no additional information."

This is the most upgraded and best-preserved of the 32 SR-71s ever built.

A full return to flight would be extremely difficult — JP-7 fuel infrastructure is gone and J58 engines are unique — but using it as a high-speed research template is more plausible.

The plane that once cruised at Mach 3.2 above 80,000 feet is simply no longer sitting where everyone could see it.

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