Airbus have been testing a long endurance ‘aircraft’ in the backblocks of Arizona, my system has been tracking it.
We have been tracking it the whole time, its just that its right on the edge of coverage of one of my systems, so every now and then it drops out, but picks up again, but resets my flight timer.
Point is, I only track the flight in bits, not a total time. I think the longest I have seen it is one whole day.
If you are looking for it, it’s the aircraft labeled ‘Kelleher’ and its over the Yuma Proving Grounds.