The Air Force estimates it would cost $1.7 billion to convert 34 older-model F-22 training jets to an operational configuration that is homogeneous with today's Block 30 Raptor fleet. Former Air Combat Command Chief Gen. Herbert Carlisle told lawmakers last summer the service was "looking very hard" at what it would take to convert the training jets to operational assets. In an August report to Congress, the service says that upgrading the Block 20 trainers to a Block 30 configuration...
