This was not a one time thing people! It's a scheduled flight!
United Airlines Flights 820 & 821! (non-stop both ways)
Their website says that it's 8067 miles.
UA820 leaves HKG at 5:05 pm and arrives at JFK at 8:35 pm. (local time)
UA821 leaves JFK at 10:50am and arrives at HKG the next day at 2:30 pm. (local time)