Andrew Tridgell was in New Zealand in January 2015 for Linux.conf.au and gave a talk on Flying with Linux.
The talk covered the progress of Linux based autopilots for UAV’s over the last year and included a live demonstration of a UAV flying in Canberra/Australia! The UAV had a Beagle Bone Black (BBB) which is a Linux based single board computer partnered with with a PXF cape containing all the sensors for an auto pilot. Not only did the BBB fly the plane but at the same time compiled the Linux kernel!