I have seen a ton of info on the net about non-rocket launch systems (e.g. balloons and planes, http://www.space.com/28504-darpa-satellite-launching-jet-alasa-x

I have seen a ton of info on the net about non-rocket launch systems (e.g. balloons and planes, http://www.space.com/28504-darpa-satellite-launching-jet-alasa-xs-1.html http://www.space.com/28504-darpa-satellite-launching-jet-ala...) but I have never seen anyone explore a glider, of course the payload would be limited to a micro- satellite. But with a glider, you don't have the fuel payload and it seems like the launch could be more controlled than a balloon. If they pull this off I wonder if there is a commercial application there ?