Predator Stalking Shadows 25

"The men had been gathered outside, under a sky festooned with stars, when they had all heard a sound overhead that had made them look up. It had sounded a little like an engine, but one that
was sleek, high-powered, almost impossibly quiet. Marcus's first thought and he suspected Scott's too, judging by the brief expression of alarm on his face - had been that Moreno and his men were making their escape. But it quickly became evident that the craft, or whatever it was, was heading not away from Moreno's stronghold, but toward it.
Like everyone around him, Marcus immediately produced his binoculars and scanned the sky, and just for a split-second he thought he saw a shimmer in the air, a brief distortion that made the stars overhead stretch and blur, as if reflected  in a breeze-ruffled pool."

"Then the anomaly was gone, and Marcus blinked and refocused and decided that the fault lay with his eyes or his equipment. He said nothing about it, and neither did anyone else and when Scott radioed through to the three snipers on the ridge they reported nothing out of the ordinary. In the end, after checking with the support team, who had satellite links with a whole slew of civilian and military high-security clearance specialists, and being told that no aircraft, either authorized or unauthorized, had been detected in the area, it was decided that the sound must have been some auditory fluke that had reached them across miles of desert from some distant location - or even, as Flynn put it, eyes wide and voice breathy with portent, "It's a ghost plane, man. A fucking ghost plane. I'm serious. I've heard about these things."pg.170 chpt.7