Budget passenger carrier SpiceJet on Monday operated India's first TaxiBot -- a pilot-controlled semi-robotic towing tractor -- at Terminal 2 of the Indira Gandhi International Airport (IGIA) here.According to the airline, flight SG-8171, scheduled to fly on the Delhi-Goa route, was towed by the TaxiBot from the jet bridge to the runway before it departed from Terminal 2 at 12 noon.The vehicle tows aircraft from jet bridge to close to the take-off point. Since the plane's own engines are not used, it saves up to 85 per cent of fuel consumed during taxiing besides substantial reduction in noise levels.