Boeing’s first 737 MAX order from a South American customer is a 60-aircraft deal with GOL, the Brazil-based low-cost carrier that already has 157 737-700/800s on order.

The order raises Boeing’s total for the MAX, which is to begin deliveries in 2017, to 724. Improved fuel efficiency is the main selling point of the MAX range; it is powered by CFM International Leap-1B engines. Combined with winglets, Boeing claims it will be 13% more fuel efficient over its competition, which includes the Airbus A320 NEO.

At Boeing’s list prices, which are usually far higher than those paid by favored customers, GOL’s order is worth $6 billion, making it the carrier’s largest in its 12-year history. GOL last ordered in September 2010 and has taken delivery of 69 737s as of August.

Total published 737 orders for 2012 rise to 764 with GOL’s order.