flightaware.com/live/flight/UAL1 … /KBOS/KEWR
Why???
Because there’s no place like home???
But seriously… monitor:
The reason may or may not show up there in a few days/weeks. Otherwise, unless there’s someone here on the flight or otherwise in the know, you probably won’t know…
Returned to Boston due to indefinite ground stop at Newark (I think due to weather).