Originally Posted by
lnuss
That seems to indicated that FSX can't find the aircraft itself. Since it works with just FSX, it apparently indicates the sim cannot find the aircraft when used with the add-on, perhaps a communication problem. However, if there is a single character difference in the aircraft name (actually, the "title" field in the aircraft.cfg) then FSX won't find it, so perhaps that application is messing with spaces or other character(s) that are not immediately obvious.
But I don't know anything about Takeflight -- you might check on flightsim.com asking for help.