It doesn’t really matter how you measure it, number of flights, duration, distance traveled, etc… No matter which, air travel is by far the safest option. The only other that comes anywhere near is trains. Going by car is bad (though motorcycle is even worse), but so many are afraid of flying that they instead takes the car. Which is among the worst things you could do from a safety point of view.
Humans are awful at accessing risk and chance, one of the reasons casinos and lotteries thrive.
Look at fear of flying for an example, all statistics say you are many many many times over more likely to get into a car accident on your way to the airport, than during the flight. Even when the ride to the airport is usually short and the flight very long. Yet people are afraid of flying, but not going by car. By percentage, there are of course those, rightly so, afraid of cars as well.
That is not how git works though. If github disappeared today it would be a lot of confusion, but the code exists everywhere it is checked out. The owner/maintainer (or anyone really) can just add a new remote and push it. If they use github specific features like issues, they would be lost though.