All the latest "state of the art" military fighters use composites almost exclusively and the "wings" (rotor blades) of the best military helicopters have been composite construction for years I think you will see as fuel cost etc increase more new commercial aircraft will use carbon composites in their construction (weight saving ergo greater efficiency, higher profits etc) and as the cost of composites reduce (relative to aluminium etc) so their use will increase in the aircraft industry. Today it appears simply a cost decision, not a quality one