Mike Cross
This accounts for some of the funnies that users complain about, like the date format and the fact that you can't include an airfield in a route (both of these in accordance with ICAO Flight Plan format).
I don't know the full ins and outs of flight plan syntax but isn't there a way to specify a waypoint as coordinates? If so, then entering an airfield name (e.g. EGHI) as a waypoint could be automatically translated into the appropriate format.
Same goes for date specification - it is easy enough to have a pulldown calendar, etc.