The longest commercial non-stop in the world, by far is Singapore flights 22 and 21 SIN-EWR. Depending on winds I have seen it take anywhere from 17 hrs 30 min to over 21 hrs flying time i haver been on it when it took 19hrs 11mins. Twice right over the north pole on SQ 21. Many times they fly over Europe. Not too many flights depart in different directions! But Singapore is on the other side of the world from EWR up and over. Very, very interesting flight - I spoke to the captain on our flight and he said we were taking a longer mile route to try to take advantage of winds - it was over 10,000 statue miles!
Do you have any idea what the longest duration in flying time and block time? I would likely be flt 22 due to jet stream factors.