Low-cost airline Ryanair is engaged in a tit-for-tat legal battle with travel booking site Booking.com. Ryanair claims that Booking.com has a negative reputation among travellers and that the site is engaging in the illegal practice of screen-scraping Ryanair’s website to display the airline’s fares on Booking.com. Booking.com has hit back, accusing Ryanair of defaming its reputation. The case is being heard in the US.