As far as the FCO deal, Dad flew with the CA that did it. The auto pilot would not engage after take off, so it was "dispached with a good A/P". Something else endend up being broken that would not allow it to engage. He said they would have had to fly to Ireland or so to be under landing weight, then what? Try to get it fixed there...? The fuel would have been close to make it back at 280 so they flew the crossing, and checked the fuel as they went. Careful co-ordinaton with dispatch was the key to getting it done. Each pilot took 2 shorter breaks than 1 long break, and he said it was easier than they expected.
Heck BGR-PWM is long enough (100+mi) with non A/P in a 150, say nothing of 10 or so hours going across the big drink.