Looking at the numbers, for example:

https://en.wikipedia.org/wiki/United_Airlines#Business_trend...

United had their highest revenue in 2024, and their profit margin was... 5.5%. Would reducing your ticket price by 5.5% make any difference?

also, don’t forget (well known fact) that passengers paying for premium economy and business class seats are the most profitable for the airlines - by far. Aside from profits from credit card rewards programs.

so the profit margin on economy tickets is likely even smaller than 5.5%!