Since the pandemic I've found plenty of airlines selling tickets and systematically cancel the flight a few days before. I was looking to scrape some data to avoid this kind of unreliable flights.
The USDT on-time performance data goes back as far as October 1987 (and you can specify the period to the download script with the --first-year , --first-month , --last-year , --last-month command-line switches).
Once the data is loaded you can use spiffy SQL to print out routes the way you like them. Unfortunately the data is also a bit dirty (which is something I'm working on).