ochmude
Marine Veteran
Or a Glock or HK. I think ICE might still authorize j-frames as a BUG, so even that could be possible.The identity of the FAMs on a flight is classified info and will not be disclosed to you.
I would start to get really worried if the gun was not a Sig .357 or .40. If it was a .40, I'd ask if I could talk to a pilot (.357 for FMSs, 40s for FFDOs the last I checked).