What seemed like an easy transition a few years ago has been delayed by one developer. “Safran and Honeywell have delayed by two years the planned entry into service of their electric green taxiing system (EGTS), a device designed to enable an airplane to taxi with its engines shut down. Aviation International News (AIN) quoted a spokesperson as saying, “The team is still working on the program with a goal of certification in 2018 and entry into service shortly after.” The system uses motors on the main gear to enable taxiing under power. One of several competing systems, WheelTug, has motors on the nose gear only. Wheeltug uses a Boeing 737-800 as a testbed for the certification program. A United States company with manufacturing apparently based in Gibraltar, WheelTug claims orders for 985 systems by 22 airlines. Another system, TaxiBot, was developed by Israel Aerospace Industries in cooperation with France’s TLD, Germany’s LufthansaLEOS, the ground-handling component of the airline. The …