Originally Posted by
sedburgh
There's one at Mojave that looks in reasonable condition :
Yes you're right.
The piccie doesn't want to show, but I think you're referring the ex. APSA one that's the oldest surviving 990. Might be possible to get it airworthy but it's been there for many years.
Actually - thinking about it the heavily modified NASA 990 that was retired a few years ago from Shuttle gear testing duty was probably the last 990 to fly, so it's probably the closest of the surviving 990's to airworthy