Comment by CamperBob2

Yes, admittedly, there could still be a reason why the GP's opinion is right, even though the numbers don't back it up. It's hard to argue that deregulation made flying safer, because as you say there were a ton of other factors in play.

However, it's impossible to argue that deregulation made flying more dangerous, as the GP believes, simply because flying didn't become more dangerous. Sure, maybe we'd be even safer in the air if price deregulation hadn't happened, but that requires an impressive amount of handwaving. Overall, the tradeoff seems to have worked out incredibly well for everyone. The only people who are really in a position to object would be climate researchers.