The deal is likely to be finalised by March 31.
Dubey also said the airline has not officially cancelled its order for Boeing 787.
Currently, Jet Airways Group has a fleet of 119 aircraft, comprising Boeing 777-300 ERs, Airbus A330-200/300, Next Generation Boeing 737s and ATR 72-500/600s.
Most domestic carriers have ambitious plans to expand their fleet amid high growth and rising demand in the aviation sector.
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