TECHNOLOGY Addressing Emissions From the Ground Up ATS' engineless taxiing concept uses electric tow cars and dollies running on underground tracks to move aircraft between taxiways and terminals. A viation contributes about 2% of global greenhouse gas emissions-a percentage that the Air Transport Action Group predicts will increase without a switch to sustainable aviation fuel (SAF). But sustainable fuels aren't the only way to attack aviation's fuel use and emissions. All photos courtesy of ATS By Ronnie Wendt 30 GROUND SUPPORT WORLDWIDE APRIL 2021 A new system from Aircraft Towing Systems World Wide (ATS) tackles the problem from the ground up. The company, based in Edmond, Okla., has introduced a concept that uses electric tow cars that run along below-grade tracks on airport ramps and taxiways to pull planes from the