United N69818
Maybe this is old news, as I'm just coming on, but I believe the aircraft in Q's >>1739490 post is United Airlines B737-900ER One Hundred N69818. It is the only aircraft in their fleet with that particular paint scheme. Note the T and E above the gap in the windows. Other United -900ER A/C have a window under the T.
https://worldairlinenews.com/2014/03/29/united-airlines-honors-its-top-100-employees-with-a-special-airplane/
If the above is correct, airport is Washington Dulles at approximately 2230 EST. Engine is CFM56-7B27, the same TMS that spit the fan blade on SW 1380 a while back.