The civilian-facing services filter USA-flight numbers because they are dicks. Some of the noise monitoring ones do, too. However, the Bruel & Kjaer ones don't. At least, they don't at LAX. This is how I was able to verify that yes, Virginia, that was a C5 Galaxy doing a touch'n'go at LAX (also known as "Los Angeles Air Force Base", having landed, stood on the runway for 10 minutes, and then departing again. Its flight track extended from the first noise monitor it acknowledged to the last noise monitor that saw it. It was some spooky shit. Fuck yeah I clicked the "report" button. Nothing ever happened.
Globemasters are fuckin' loud and they look like a B-52 that ate a 747. And they carry things that go bump in the night.