This feature is a genuine mystery. Jeff Glickman spotted it and, at first, it was a real mind-blower. The "airplane" even appears in a second image, although it seems to be facing in the opposite direction.
The "trail" is real and seems unnaturally straight. It only appears in this one image and it is not present in later aerial photos or satellite images, so it seems to have grown back in, which suggests that it was man-made.
After careful scaling, Jeff determined that the "airplane" is about twice as big as a Lockheed Electra, so unless somebody landed a DC-3 there (don't even GO there) it's not an airplane. It's possible that the "trail" and/or the "airplane" are somehow associated with the hypothetical Camp Zero. We don't know what the hell it is but you can bet that we'll be checking it out that area when we go back.
Lessons:
• it's easy to be fooled by shapes
• accurate scaling is crucial
• there is no substitute for ground-truth (physical hands-on inspection)