Umberto,
I don't know if you can answer this now since Flight (and it's details) hasn't come out yet but would the system for Flight developed airports work the same as the FSX and FS9 airports? Meaning, if you have bought 5 Fsdt sceneries for FSX would you have to pay for the Flight versions of those airports (assuming you upgrade them) or would the order numbers be the same for the Flight versions (essentially a free upgrade)?
Regards