For years American Express has had an ‘International Airline Program’ for Platinum and Centurion cardholders which amounted to 2-for-1 business class tickets provided you were buying full fare.
This has had limited usefulness for many cardmembers, often full fare business class is about twice as much as discounted advance purchase business, at most you’d save a few hundred dollars buying business class for two passengers. A limited subset of cardmembers, though, found this very useful.
Last June they revamped the program and made it much more useful. And now you do not even need to call to use it.