Originally Posted by
seawolf
Too much investments dollars required by many countries as well as airlines and airports without any obvious benefits. ROI is simply not there.
Agree. That makes sense theoretically, but once you start recognizing the massive technological and capital investment required by - at the very least - dozens of countries in a way that they would all be able to talk to each other, it looks extremely daunting. You can conclude that it ain't happening any time soon.