Additional Aircraft can be downloaded from some of the archived sites. These aircraft may not be always loading correctly or showing their textures.
Here are the sites for download: search for the aircraft for example : "c182_20080808.zip" (with quotes)
This site lists many many aircraft
http://mirrors.ibiblio.org/flightgear/ftp/Archive/Version-2.x/Aircraft-2.0.0/
To install the aircraft, simply download the file and copy it into the Flight Gear AIrcraft folder, then uncompress (unzip the file)
The aircraft should show in the launcher (in full color, though in-simulator it may not display all its textures).
In this case, we have chosen the PIlatus PC 7
The PC 7 in Flight Gear One 2026 installation
The form of the aircraft comes out quite nicely and the transparencies and seats show as well
The instruments need to be added, of course.
The aircraft is quite flyable, with realistic flight characteristics as far as I can determine, and a very nasty wing drop on stalling, which a air force sim also exhibited when I flew it in 2023.
The PC 7 in Flight Gear 2026 - works fine
January 8 2026