Delhi airport authorities after 'air-purifier' plants have taken another environment-friendly step by introducing TaxiBots, 'pilot-controlled semi-robotic machines' manufactured by Israel Aerospace Industries (IAI), which reduce emissions and fuel-consumption by a stunning 85%. Gurugram-based KSU Aviation will operate the TaxiBots at both Delhi and Mumbai airports, as per the contract between the two companies. Two TaxiBots will be tested from September till December. Last week, IAI had announced that in phase-2, 38 more such vehicles will be supplied to both the airports in four years, of which Delhi will get 17. Delhi airport "will be the world's first airport to operationalize TaxiBots." At Frankfurt Airport the two testing TaxiBots have already finished their certification trials. The aircraft will not be using its own engines as it'll be towed away by it from jet-bridge till runway. This reduces the aircraft's taxiing fuel consumption cost, which was found to be 85% during the certification trials. Noise pollution also reduced by 60%. TaxiBots will be used only for departure flights. They will reduce boarding-gate congestion too. CO2 and other noxious gas emission will drastically reduce.