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The external lights on aircraft fall into two general categories. The first is navigation lights or beacons that are always illuminated while the aircraft is in operation. A second type includes takeoff and landing lights that are used to improve visibility when the plane is close to or on the ground. Several of these lights are discussed in greater detail below.
Originally posted by cloakndagger
Could the FAA be trying to cover something up? If people start seeing more and more actual UFO's with the classic 3 light triangle configuration they can brush it off as an airplane. Another control mechanism being put in place? Makes you think. The one thing they can not change and that is UFO's do not make loud jet engine sounds.