I wrote about this many years ago:
https://gomox.medium.com/i-have-a-marketplace-business-idea-...
At the time I was actually doing this exact business idea and one of our founders worked at an airline.
At the time I was actually doing this exact business idea and one of our founders worked at an airline.
"[...] Identifying which side of the marketplace is more scarce and focusing on supplying that."
:D