@rysiek THe non-malicious interpretation is that you will get hit by this unless their website can, positively and with certainty, determine that you're a human and not a bot run by a competitor. If you're deliberately installing software that prevents this from happening, the results speak for themselves.
THe airline industry is extremely cutthroat, and companies have a habit of scraping airline websites and posing as web browsers to sell tickets at a profit, usually with a far worse customer service. Airlines have very little choice here.