Never thought I would hear someone making that argument. You think we should let more people die in plane crashes so that flying is cheaper?
We already know cheap flying with current safety standards is economically viable, with costs approaching the cost of fuel; see low cost airlines like Ryanair. So the most effective way to lower prices is for airlines to downgrade amenities and services onboard.
I think flying could be made cheaper and massively more convenient by getting rid of airport security the way it is done right now. Imagine planes being boarded like trains: there might be a security tradeoff but it would be offset by the massive time benefit for everyone involved.
I know I would take that risk, I consider my own time to be more worthy than TSA considers it to be
I don't think anyone is arguing about security to board a plane. They're talking about maintenance requirements and safety requires for when a plane is in flight. Things like airplane inspections.
As an example: planes almost never crash. Which is great! So you could drop the requirement to carry life-vests, without compromising safety numbers.
(If you want, you can invest 50% of the cost savings into eg anti-malaria nets, and you'd come out way ahead in terms of lives saved.)
Similarly, airplane seats are massively over-engineered. You could loosen restrictions there, and save weight and thus costs.
I think Japan might already have different domestic regulations there. I remember being on a domestic flight between Kobe and Tokyo, and the seats in economy class used a lot of mesh over aluminium frame or so. They looked a lot lighter (and also more breathable) than your typical airplane seats. See https://photos.app.goo.gl/ZDWQTNMB93mQs5Yz5 for a picture that I took.
I also agree with vlack-vingaard, but they already gave some good examples.
We already know cheap flying with current safety standards is economically viable, with costs approaching the cost of fuel; see low cost airlines like Ryanair. So the most effective way to lower prices is for airlines to downgrade amenities and services onboard.