The Airborne Laser Laboratory was a less-powerful prototype installed in a Boeing NKC-135A. It shot down several missiles in tests conducted in the 1980s.[6]
The Airborne Laser program was initiated by the US Air Force in 1996 with the awarding of a product definition risk reduction contract to Boeing's ABL team.[7][8] In 2001, the program was transferred to the MDA and converted to an acquisition program.[8]
https://en.wikipedia.org/wiki/Boeing_YAL-1