GBAS is a no cost option on Boeing 737-Next Generation (737-800/-900), Airbus A320, A330/340, A350 and A380 aircraft.
Using Honeywell’s SmartPath Ground-Based Augmentation System (GBAS), Boeing used its ecoDemonstrator 787, a flight test airplane that in 2014 served to assess more than 25 technologies to reduce aviation’s environmental footprint, to complete 12 CAT III approaches and landings at Boeing’s test facility in Moses Lake, Washington.
SEATAC has a proposal to install a CATIII system.