I was recently told by a ZTL controler that VATSIM doesn't condone the use of the ICAO flight plan format. It's not manditory until 2017 but, its been prefered for PBN equipped aircraft for some time. I quote:


My real airline has been using it for well over a year domestically, and my VA operates the same way.
Is the controller mistake or is VATUSA too behind the times??