I'm curious, how does one gain access to flight schedules/fares? Is this something that anyone can get their hands on and create a service (complexity aside), or do you need some sort of license that costs thousands of dollars? Does each airline have their own way of exporting this data? Is there a single entity that aggregates from all of them? How does the actual data look like? (Is it a dump every X hours, or some…
There is a GDS that all (or most) vendors send data to https://en.wikipedia.org/wiki/Global_Distribution_System Downstream companies then query this data and show them to you. The competition comes from the complex caching and delivery mechanisms that the companies use to get you the best price. It's not really an area that is ripe for disruption. The margins are extremely low and there are only really two companies…
I know that for airlines like easyjet you need to visit their website to get fares though. (Or Google would have to build a site crawler)