The OpenFlight format is an defacto industry standard format in the visual simulation industry, developed by Multigen Paradigm Inc. (MPI) Here is the web link: http://www.multigen.com/products/standards/openflight/index.shtml

The old OpenFlight plugin osgdb_flt is moved out of the core to the deprecated SVN directory structure.
svn co http://www.openscenegraph.com/svn/osg/OpenSceneGraph/deprecated deprecated
To use the old plugin set the environment variable OSG_OPEN_FLIGHT_PLUGIN=old

Option strings for OpenFlight reader

billboardCenter	Set billboard rotation point to center of face.
dofAnimation	Enable animation on DOF nodes.
Texture:
clampToEdge	Use texture wrap mode CLAMP_TO_EDGE where CLAMP is specified.
noTextureAlphaForTransparancyBinning	Do not enable alpha blending based on image translucency.
Structure:
preserveFace	Preserve Face information like name and comment by translating each face record into an osg::Geode.
preserveObject	Preserve Object information.
Externals:
keepExternalReferences	Externals will be left as ProxyNodes?.
cloneExternalReferences	Externals are cloned.
Units conversion:
convertToFeet	Convert units to feet.
convertToInches	Convert units to inches.
convertToMeters	Convert units to meters.
convertToKilometers	Convert units to kilometers.
convertToNauticalMiles	Convert units to miles.
noUnitsConversion	Disable units conversion.

MultiGen?, OpenFlight, and Flight Format are registered trademarks of MultiGen? Inc.