Challenger 604 That Boeing Has Used For Other Things?

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?

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