@KnuckleJoe
You may want to ask your dad why he, and all other long-distance pilots, consistently follow "great-circle" paths to minimise fuel.
I live in Sydney, Australia. If I fly to Santiago, Chile, the plane follows a path that curves far to the south, close to Antarctica. In fact, depending on weather and winds, it is sometimes possible to see the continent from the plane. If FE maps were correct, this would be sheer madness; it would be far quicker and cheaper to fly northwards, across the USA. The same thing happens when I fly to Johannesburg, South Africa. Again the plane flies far south, rather than going across Asia.
Now compare the normal Sydney-Santiago flight with one that follows a straight line on a FE. A flight via a great circle takes about 13.5 h, as measured by the watches of both pilots and passengers. The "straight-line" one would take over 25 h. That figure becomes clear when you realise the straight-line flight would take you over Los Angeles. Sydney-LA takes 14.5 h, and LA-Santiago 11 h, for a total of 25.5 h, again as measured by pilots and passengers alike. For more explanation and pictures see:
https://flatearth.ws/sydney-santiagoNow ask your dad which route he prefers to fly; I bet he won't fly "straight-line".
The only way out of this dilemma is to assume that the airlines somehow reset all the personal watches of everyone onboard a plane. And yes, all watches would need to be changed: mechanical, quartz, wristwatches, alarm clocks, in carry-on luggage, in checked luggage, the one you didn't even realise you'd packed, the plane's clocks, clocks in shipping containers, every single damn clock on the plane. It's either that, or someone will realise there's funny business going on.