People who keep these power packs in their pocket are just asking for self immolation sooner or later..................
Many of these power banks are cheap, Chinese garbage you can buy on Amazon for peanuts. They shouldn’t be allowed anywhere near an aircraft. There’s plenty of places in airports and on most planes to charge your phones.
I’m a frequent flyer and the only planes that don’t have chargers these days are short, connecting flights.
Overfilled a Zippo and put it in my pocket once.
Ouch.