"Colin W Kingsbury" wrote:

Free Flight is not an incremental step--it's a complete change of doctrine
and I don't trust making that kind of leap.

You are absolutely right. Certainly the concerns you identified are real. One of
the things I do is design avionics for large aircraft, so I'm in the middle of a
lot of the discussions on how to manage the transition, which has to be
evolutionary - not a huge leap.