[hilbertseries]

If the airline profits are incredibly high then someone with a large amount of capital will start their own airline to compete.

[MikeTheGreat]

Starting a brand-new business to compete with an established monopoly/duopoly/oligopoly that's capital intensive doesn't seem like a thing that's likely to happen.

If people decided to enter markets purely based on profits then shouldn't there be a bunch of competitors for Google's search engine biz?

[oat_bravo_nap]

Well if what people are predicting will happen, then there will be a lot of bankrupt airlines that will have planes being auctioned off.

As to your second part, search engines aren't a high profit business; advertising is.

[macrolime]

You do realize that there are lots of low cost carriers that were started to compete with the expensive incumbent airlines?