Totally new flight dynamics files redone by Alexander M. Metzger
15 new "Bird Dog" liveries of different countries and epochs
5 new mdls, including wheel A version, ski, floats versions with military and civil pilots
Four different virtual cockpits
How to get this:
If you already have BirdDog in your hangar, just redownload and reinstall the bird (don't buy it again). You can find BirdDog download link in your "SibWings Cessna O-1/L-19 Bird Dog activation details" email.