Travel sites with flight booking facility have detailed information about the flights connecting between major destinations. If gathering flight data is your requirement, scraping travel sites using web crawling and extraction is the best way to proceed on this route. The data can be used for running your own aggregator site by getting a constant supply of flight schedules and pricing data from the web. In fact, scraping flight data using web scraping is all you need to start your own travel company. Travel sites like Goibibo, Expedia
, Makemytrip, Flightradar24, Cleartrip etc. have the flight schedules and their price data which is available to be crawled and extracted using web scraping.