The long commute has been going on for a long time in BA. Some 20 odd years ago as a junior B744 Capt. I turned up for a Dtw trip and was joined by the co-pilot at briefing. (2 pilot sector) First he got up my nose moaning about going to Dtw, he was very senior and spent his time in high allowance trips to Hkg and Nrt etc.
At top of climb out, I noticed his eyes drooping and less than total concentration. On asking if he felt OK, he said he was very tired as he had arrived overnight from Newark USA where he lived, on the jump seat, and 4 hours before our flight. !! I wasn't impressed.