United inherited a bunch of long-range 757s with the Continental merger. I flew one Newark-Stuttgart one summer. United saw it as a cheaper way to fly transatlantic with a smaller crew.

Problem was that the aircraft couldn't make it back to the US on a single tank of fuel if the jet stream was too strong. Which happened a lot. So we got a nice detour to Goose Bay for refueling and nearly missed our connection. The regulars joked that YYR was the new United hub on the east coast.

I don't think UA does this much anymore. Maybe COVID killed that route too.

My favorite plane to fly on, was the 767, but that's been gone for a long time.