00-9001 just took off (for the first time in 11 months) in Portsmouth, NH.

https://en.wikipedia.org/wiki/486th_Flight_Test_Squadron

The 486th Flight Test Squadron was activated by 1995. One former employee describes it as a "classified unit" and "a selectively manned, one-of-a-kind unit." [6] Very little is officially acknowledged about the classified missions of the 486th FLTS, which is, in fact, not a test unit at all, but a quick-reaction transportation operation utilized by the Federal Emergency Management Agency, the Domestic Emergency Support Team, and the Foreign Emergency Support Team to respond to terrorist incidents worldwide.[7][8] The aircraft may also be utilized in conjunction with the Special Activities Division of the Central Intelligence Agency.

They also run ops for the FBI with these all white aircraft.

Look at the callsign. TRIX77. Trix are for kids. 77.