Good find Tom! And we complain about flights now a days!
Longest single plane flight I was ever on, time wise, was on a Continental Charter to Vietnam on a Government All Expenses Paid trip in 1966!! 24 Hours actual flight time with several stops across the Pacific for refueling! ( Return trip was longer but was broken up with layovers!)
Second place was on Quantas to Australia from SFO, 18 Hours!!