Well, I assume that:
a) part of the point is that it didn't turn out well when one pilot left the cockpit to pee (can also be replaced with nap I guess)
b) it doesn't help a lot if both pilots pretty much arrive tired for their shift
c) power naps do not replace actual sleep and some pilots also thought of that, it's mentioned in the article
d) part of the problem are regional flights were the pilots probably can't power nap in the short time they are in the air and probably have other things to do between flight, like checking the airplane, filling out forms, coordinating with staff and so on, the article says international flights over longer distances are less problematic and less stressful, especially since the number of takeoffs and landings is lower there, which put the pilots through a lot of stress since they are the most dangerous parts even for experienced pilots.
How about we ban flights under a certain distance and start to research really fast trains for those distances instead? Imagine the resources one could save by not propelling people 10km into the air only to come down again 20 mins later. The pilots who lose their jobs will apparently earn more as train drivers as well, possibly because of the lower fuel prices.
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