From where (departure airport)?cantona7 wrote:when i flew to and from china the sun never set.
If you departed from Newark/NYC/Philly/DC/Chicago/MSP, you would have flown over the North Pole. So yes, one could easily fly to and from China on this route and see the sun the entire time.
But the statement was overnight trans-continental, and the only continent this would be possible is Antarctica.
Also something to consider is that the majority of trans-oceanic/trans-polar flights in a westerly direction are during the day and easterly direction are during the night. The main reason is business. The easterly flights generally tend to arrive at their destinations early in the morning. The westerly flights generally arrive mid-day to mid-afternoon East Coast. mid-afternoon to early evening West Coast.
Peace.