Good observation, Jeff. And in your experiment, you were not injured, dehydrated, starving, delirious with heat stroke, and emotionally devastated from watching your last link with the outside world -- in their case, the aircraft and radio -- get swept into the surf. If it is true that Amelia hobbling with an injured ankle and Fred was even more serioiusly injured, then after a full week on that wild island, they might even have considered Lambrecht's "zooming" somewhere above the tree cover, over the crashing of the surf, to be just another hallucination, as they lay gasping for breath with parched throats on their coconut-leave mats in the foliage. Considering their physical, mental and emotional exhaustion, it might have taken them precious minutes through their disorientation to even understand what they might be hearing. Other posts have suggested that if they expected rescue at all, it would be from the sea, so this aircraft buzz would indeed be unexpected. After seeing -- and missing -- the Lambrecht flight, they may have been too weak by that time to devise appropriate air-rescue signals, except those ambiguous "signs of habitation." I find it more and more believable that AH and FN were either dead or too disabled to respond to the Lambrecht overflight.