epa01822484 'NO ROADS' trekking company owner Peter Miller (top C) and friend Rob Armstrong (L) console Kokoda Track guides at Port Moresby Airport, Papua New Guinea on 13 August 2009. The cause of the plane crash near Kokoda that killed 13 people including nine Australians remains unknown, according to the head of Airlines Papua New Guinea. EPA/DAVE HUNT AUSTRALIA AND NEW ZEALAND OUT