Having communicated with JL and learned of the trip, on the day of their crossing the Atlantic I was myself in rural Ireland west of Dublin, overseeing aspects of a civil engineering project. For some reason awaking early, before sunrise, I had a look, thanks to the hotel wireless, at FlightRadar for the flight in question, given that various transatlantic flights pass that way, only to find that they were just passing overhead Knock airport, and seemed to be headed absolutely straight for me. A few minutes later I was outside in the morning cold, scanning the western sky, with the stars out in places, clouds elsewhere, and although I might like to think I could ID the actual aircraft, there was it's growing jet trail, just picking up whatever light was around as it spread south-eastwards right behind, absolutely directly above me, with an accuracy that Mr WHBM Senior, one-time WW2 RAF bomber crew navigator ^ , might surely have expected. FR at maximum zoom showed their track less than a mile to the south, at a height of 7 miles. And then they was gone, and it was just an early morning tractor coming along the main road as a farmer headed off to his morning milking. A wave was returned, but he must have wondered what on earth I was doing standing there in the dark in my jogging kit. The jet trail gradually spread out, diluted, and disappeared, as they do. 30 minutes later the aircraft was passing abeam my house in London, which I returned to myself that evening. It took me more than 30 minutes to get there ...

I hope the cabin crew were just putting together a pleasant breakfast as you passed by, JL ! Isn't air travel fascinating.