The government on Thursday said 11 of the 14 A320neo aircraft that were grounded due to Pratt & Whitney engine issues have started flying again after change of engines. P&W engine woes had forced grounding of 11 A320neos operated by IndiGo and three flown by GoAir. "As of now, 11 of the 14 grounded aircraft have started flying after changing the engines," Minister of State for Civil Aviation Jayant Sinha said in a written reply in the Lok Sabha.