Its a defense system built to be installed on passenger jets.

The Wall of Fire The Wall of Fire is the next generation defense system that can destroy high speed missiles. Lockheed Martin is using a 747 as a host for the system. If all goes as planned then the United States will be a little safer. Some critics though are skeptical about weather the system can really work. Lockheed Martin and Boeing are working together on the optics for the prototype ABL (Airborne Laser). The ABL …

…cavity with the singlet delta oxygen. This injection of gas excites the iodine and drives the laser. Detection begins with a satellite recognizing the ignition from a missile which in turn sends the coordinates of the missile to the ABL. Then the ABL scans for the missiles exhaust once locked on another laser determines the distance. After locking on yet another laser fires on the missile long enough to ignite the fuel within the missile.