WASHINGTON (Reuters) - The U.S. State Department has approved the possible sale to India of one Boeing C-17 transport aircraft, with an estimated cost of $366 million, a Pentagon agency said on Monday. The Defense Security Cooperation Agency said in a statement it notified Congress on Monday of the sale, which includes four turbofan engines, a missile warning system, a countermeasures dispensing system and an identification friend or foe transponder.      