re: The world's longest flight, 18hrs from Auckland to Qatar

The NYC-SIN nonstop flight isn't currently flown by Singapore Air. They did it using A340-500s and I believe will be restarting the route with A350s. The A345s were all business & premium economy, no regular economy seats.

My mother has flown SYD-DFW on Qantas, which is one of the longest flights in the world. She was 64 when she flew it (in coach) and didn't complain, but she's also fit and in excellent shape for her age. Not sure if she was on the 747-400ER or A380.

My longest was LAX-AKL in coach on Qantas (thank God it wasn't on United ), which took 13 hours. It's not so bad, but I don't like how you tend to get dehydrated on long flights, even if you're drinking a good bit. On the other hand, it was my first and so far only 747 trip (flew back on the same plane).

Updated list of longest airline flights by distance