> You often still need to negotiate individual agreements with major airlines in order to be able to publish and sell their fares.

Out of curiosity, what's stopping you from just scraping/crawling this on a daily basis? I'm at a scale-up that offers a BI solution for the hospitality sector, and we scrape well into the tens of millions of data points per day using web crawlers.

They obviously don't want you to, so it's an ongoing cat and mouse game of integrations breaking, but once we we're established and had a customer base, the ability to negotiate data API agreements actually opened up. Especially if you have data to offer in return.