Besides the Boeing and Saab collaboration, three other teams (including Lockheed Martin and Northrup Grumman) are putting forth bids for the contract to replace the trainer. The Air Force plans to start looking at proposals in December, and we're starting to see glimpses of many of the designs already in the works. Ultimately, the Air Force is looking to buy 350 new jets to train their pilots on for decades to come, and a 350-jet contract is pretty good business for whatever team can get it.