This latest-generation surveillance system for tracking the movement of aircraft and vehicles around the airport is vital because FRA will be inaugurating a new runway in October 2011 and the new Pier A-Plus at Terminal 1 in summer 2012 - plus additional ramp areas and a new Terminal 3 in the future. Fraport chose to replace all existing Sensis multilateration sensors in use at the airport with the latest-generation sensor for precise surveillance of all aircraft and transponder-equipped vehicles operating on the airport surface. Frankfurt Airport was the industry's first airport to select multilateration for surface surveillance, awarding Sensis a contract back in 1999. Since then, the Sensis system has been expanded or altered several times to meet FRA's changing geographic and traffic requirements.