Comment by lnsru

Sounds really interesting what’s happening there. Long story short: I once applied as a hardware developer for RF systems. Air traffic control systems were one of the topics. So basically digital solution exists, it’s light years better than current systems. The problem is the more or less simultaneous worldwide rollout of the new systems. On planes and airports… Because nobody wants to pay for a solution that supports both new and old communication standards. The old one is somehow enough for the most of the world.