In addition to all the other documents need to fly, perhaps a mental health certificate should be included.
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Why cause another hassle to millions of travelers? There’s a much more sensible solution, namely legislation mandating jail sentences for any disruptive behavior that requires the flight crew to abandon the original flight plan. The world is fraught with all manner of abhorrent personal behavior because those guilty of it suffer no adverse consequences. Heavy fines and/or minimum one-year prison sentences and/or permanent enrollment on the “no fly” list should bring an end to most of this nonsense.
Sorry, after all those incidents of people going wanka on flights you’d think another certification would be needed. I was just waxing funny. I’m glad I’m no longer flying commercial but now piloting bizjets where we know our clients.
Sports arenas in major cities have a judge and a jail in the premises because of known rowdy customers and fights breaking out after alcohol is consumed.
On a plane, the pilot is the judge, and there should be a sequester cell, preferably sound-proof, with a latrine in the corner. The unruly passenger must surrender a driver's licence, passport or credit card like a regular jail, in case of damages. Civil authorities assume custody upon landing.
In this case, the other passengers should not have had to delay their arrival in Italy because of a disrupter.
Imagine the perp landing in an Italian jail and courtroom. Their "rights" are not like ours, their trials go on forever, and their prisons are full of really bad guys, easily as bad or worse than ours.