[NikolaeVarius]

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 that make a majority of the money. Expedia and the Priceline group.

[baby]

I think Amadeus is a popular one, matrix itasoftware is another one.

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)

[wodenokoto]

Is momondo under one of those? At least where I live it is the biggest by far and I always thought it was globally in the top.