The launcher is just a fancy way to run FlightGear, you can do anything that the launcher does using the command line. It won't be very comfortable because the command line will be very long, but it is certainly doable.
For example, get any aircraft from FGAddon (
https://sourceforge.net/p/flightgear/fg ... /Aircraft/). The dragonfly is a very small light aircraft you can use to check if everything works (and it is fun for short trips and learn the very basics). Save the aircraft directory wherever you want it. For example, "$HOME/Documents/Aircraft/Dragonfly". Or "$HOME/.fgfs/Aircraft/Dragonfly", if you prefer. Then, pass the parent directory to FlightGear:
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fgfs --fg-aircraft="$HOME/Documents/Aircraft" --show-aircraft
The options in the command line are described here:
http://wiki.flightgear.org/Command_line_optionsJust remember: if you download the aircraft from some repositories, the directory name often includes a some particles you must remove. For example, I tried to download a snapshot of the directory of the Dragonfly and the directory name is "flightgear-fgaddon-r5214-trunk-Aircraft-Dragonfly". You MUST rename this directory name to the original "Dragonfly". The name of the specific directory where the aircraft is installed is NOT configurable. Check the README.txt, if the aircraft includes it. Check also lowercase and uppercase letters.
Also, according to the wiki (
http://wiki.flightgear.org/North_American_P-51_Mustang ), the specific name for the P51D is "p51d-jsbsim". You'll find out these names using the option "--show-aircraft"
Anyway, if the launcher doesn't work for you, most probably you don't have the QT libraries (I believe they are optional in Debian). Just in case, run this command and tell us the error, if any:
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fgfs --launcher