So far as I am aware, there are no recorded instances of anyone dying as a result of flying after Scuba diving.
However, it is widely recognised that flying creates in increased risk of decompression sickness, and there are plenty of divers who have suffered minor DCS incidents on aeroplanes.
This is why divers are always recommended to wait at least 12 (and preferably 24) hours after finishing a dive before they fly.
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As most commercial high altitude jets pressurize to about 7psi, or a little less than half normal surface air pressure (14.7 PSI), this increases outgassing of saturated tissues and, in borderline cases, may result in the Bends -- formation of gas bubbles in your boy's tissues.
Modern dive computers can take this into account, and will show you a "No Fly" period, where you should hang out at the hotel, sip a cool drink and relax until you're safe to fly. Without computers, divers who had in-gassed, but not extremely, would spend a day or two prior to flight without diving in order to outgass to the point of safety.
I personally do both.
Your parachute might not open and the ground is very hard. You could die from a heart attack, or suffocate if you are too high up and there is not enough oxygen to breath, or you could freeze to death if it's very cold. You could land in water and drown, or land in someplace you shouldn't, such as a highway, or in trees and be impaled on the branches. There are a lot of ways to die, and a person should not jump if they are not trained properly.
you can but you wont i think like 3 people die a year from it and that's because they hit stuff when they land