[highcountess]

Military flights do not fly ADB hot outside of the DC FRZ. It was also clearly exactly following flight route 4.

There are a few locations in that area it could have been coming from. Anything else would have made no sense flying through the FRZ from/to Belvoir.

[reaperman]

What is "flight route 4"?

[matheweis]

The FAA publishes supplemental charts specifically for helicopters in areas with high concentrations of helicopter activity: https://www.faa.gov/air_traffic/flight_info/aeronav/productc...

Specifically the Baltimore-Washington route chart was relevant for these flights: https://aeronav.faa.gov/visual/10-31-2024/PDFs/Balt-Wash_Hel...

If you find the DCA airport on that chart, you’ll find routes 1 and 4 which roughly correspond to the helicopter’s flight path.