This Challenger 604 taxied out at Boeing Field and I was slightly curious because it was in a grey paint job with a US flag on the fin. I didn’t think it was a government owned machine but maybe there was something interesting about it. When I got a good look at it, I could see that the airframe had some modifications. There were ventral fins and a fairing on the underside that looked like it might have been used for mounting something else which was now absent. A check on the registration shows it as registered to Boeing. They had a development program a while back to make a maritime patrol aircraft from the Challenger. Was this airframe part of that program originally? Where is it going now?
