Very very few.

Air travel in the US averages 0.2 deaths per 10 billion passenger-miles.

Driving is 150 deaths per 10B P-M.

Driving across a small town is more likely to kill you than flying across the country.

That is current. I suspect the longer that an industry has heavy self regulation, the higher the cost is.

I also do not agree with the premise that imposing stricter regulation would "double" the cost of tickets. Airline tickets have come down in price for MANY reasons, not just less regulation.

Do you know that correlation does not imply causation?

I would suggest the site https://www.tylervigen.com/spurious-correlations