[1] The US Airline Industry is Highly Profitable https://airinsight.com/2016/08/18/us-airline-industry-highly...
[2] The Most Hated U.S. Airline Is Also the Most Profitable https://www.bloomberg.com/news/articles/2014-04-10/spirit-ai...
[1] The US Airline Industry is Highly Profitable https://airinsight.com/2016/08/18/us-airline-industry-highly...
[2] The Most Hated U.S. Airline Is Also the Most Profitable https://www.bloomberg.com/news/articles/2014-04-10/spirit-ai...
https://en.wikipedia.org/wiki/List_of_airline_bankruptcies_i...
If you look at the profits of existing airlines over the past decade then you're suffering from selection bias. You're also looking at a period soon after a bunch of big airlines were able to unload a lot of debt through bankruptcy. Between 9/11 and 2006, five major US airlines went through Chapter 11, so some of their subsequent success is funded by their former creditors. I don't know if any of that overcomes their recent profits or if the industry has become profitable even accounting for those things. It's certainly possible that they've finally figured out how to consistently make money in the long term.
Furthermore, a lot of international carriers have historically been government subsidized.
It certainly hasn't been a great business for most of its history.