The VASI (Visual Approach Slope Indicator) and the PAPI (Precision Approach Path Indicator) are systems of lights that provide guidance information to help pilots acquire and maintain the correct approach to an airfield. They are generally located beside the runway. These lights can be seen from up to 8 kilometers (5 miles) during the day and up to 32 kilometers (20 miles) or more at night. Further information is available in the video below:
8/18/2009 – EDWARDS AIR FORCE BASE, California – The Missile Defense Agency’s
20090810 USAF photo Jim Shryne – YAL-1A Airborne Laser aircraft
Airborne Laser YAL -1A prototype aircraft successfully acquired, tracked, provided atmospheric compensation and simulated the directed energy kill sequence against an instrumented boosting missile target using three onboard low-power lasers on August 10.