This is called domain adaptation and transfer learning in the literature. There are ways to do that. It is an active area of research. Basically the idea is to

This is called domain adaptation and transfer learning in the literature. There are ways to do that. It is an active area of research. Basically the idea is to run a few real world dogfights (you could conceivably collect a few hundreds), and use methods to adapt the simulation model to the new domain. Solutions involving unsupervised learning (e.g. no dogfight, just collect sensor data from fighters - you could collect thousands of hours this way) are also active areas of research.