Caught a quick glimpse of an airliner, possibly a B767, heading into Baldonnell this morning, it seemed to have a similar colour scheme as Air Force 1,
Maybe related to this:
It flew overhead, not a widebody.
USAF C3-40 which is a 737. Sounded quite a bit louder than a 737.
Saw it on the decent, and managed to lookup Flight radar - SPAR15 I think, from KIR looking well
As others said, the US Congressional visit