I've seen them in IAH, gate over in A, also in IAD off the west end of B. Call sign "Friendly" if you ever hear that around the pattern. Not sure where they fly to out of those airports. Saw them have an engine fire at the gate in IAH a few months back, ARFF was hosing them down as we were pulling onto the ramp on the south side of B.

From what I can decipher online, looks like Gulfstream 2.0. I think some of the planes are even the same ones Cooper used to use to follow full 1900s out to the Bahamas with bags back in the day.