I while back someone posted a similar topic to this, I was just curious to see how those figures have changed over the last year.
Personally, my longest flight was from Dallas to Sydney in a Qantas Boeing 767, took 17 Hours and 46 Minutes.
There is already a topic exactly like yours.
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paris CDG- auckland intl
Please post it in here Infinite Flight Longest Flight Time Record (30 Hour Minimum to Submit)