Inspired by the thread about Iraq's COIN aircraft bids,
In military aircraft it is common that one company licenses another to build essentially the same aircraft. Why then are these clones competing in the same contests? The Raytheon T-6, for example, is based off the Pilatus PC-9 - but they are both up for the same contract. Same for Boeing's T-45 and the BAe Hawk.
Can anyone shed light on this for me?