Japan Air Lines flight 1628 was a UFO incident that occurred on November 17, 1986 involving a Japanese Boeing 747 cargo aircraft. The aircraft was en route from Paris to Narita International Airport, near Tokyo, with a cargo of Beaujolais wine. On the Reykjavík to Anchorage section of the flight, at 17:11 over eastern Alaska, the crew first witnessed two unidentified objects to their left. These abruptly rose from below and closed in to escort their aircraft. Each had two rectangular arrays of what appeared to be glowing nozzles or thrusters, though their bodies remained obscured by darkness. When closest, the aircraft's cabin was lit up and the captain could feel their heat on his face. These two craft departed before a third, much larger disk-shaped object started trailing them, causing the pilots to request a change of course. Anchorage Air Traffic Control obliged and requested an oncoming United Airlines flight to confirm the unidentified traffic, but when it and a military craft sighted JAL 1628 at about 17:51, no other craft could be distinguished. The sighting of 50 minutes ended in the vicinity of Denali (formerly Mount McKinley). As soon as JAL 1628 straightened out of its turn, at 05:11 PM, Captain Terauchi noticed two craft to his far left, and some 2,000 ft (610 m) below his altitude, which he assumed to be military aircraft. These were pacing his flight path and speed. At 5:18 or 5:19 PM the two objects abruptly veered to a position about 500 ft (150 m) or 1,000 ft (300 m) in front of the aircraft, assuming a stacked configuration. In doing so they activated "a kind of reverse thrust, and [their] lights became dazzlingly bright". To match the speed of the aircraft from their sideways approach, the objects displayed what Terauchi described as a disregard for inertia: "The thing was flying as if there was no such thing as gravity. It sped up, then stopped, then flew at our speed, in our direction, so that to us it [appeared to be] standing still. The next instant it changed course. … In other words, the flying object had overcome gravity." The "reverse thrust" caused a bright flare for 3 to 7 seconds, to the extent that captain Terauchi could feel the warmth of their glows. Air traffic control was notified at this point (i.e. 5:19:15 PM), who could not confirm any traffic in the indicated position. After 3 to 5 minutes the objects assumed a side-to-side configuration, which they maintained for another 10 minutes. They accompanied the aircraft with an undulating motion, and some back and forth rotation of the jet nozzles, which seemed to be under automatic control, causing them to flare with brighter or duller luminosity. Each object had a square shape, consisting of two rectangular arrays of what appeared to be glowing nozzles or thrusters, separated by a dark central section. Captain Terauchi speculated in his drawings, that the objects would appear cylindrical if viewed from another angle, and that the observed movement of the nozzles could be ascribed to the cylinders' rotation. The objects left abruptly at about 5:23:13 PM, moving to a point below the horizon to the east.