Sao Paulo - GOL seems to be quite satisfied with the performance of its new 737 MAX 8 jets. The airline announced that it would accelerate the acquisition of Boeing's new generation single-aisles.

In a statement, the Brazilian carrier said that it would sell 13 Boeing 737NG aircraft between 2019 and 2021 and increase the pace of acquiring the new, more efficient substitutes.

With these replacements, GOL aims to increase the flexibility of its fleet while maintaining the capacity, says Celso Ferrer, vice president of planning at GOL Linhas Aereas Inteligentes. Ferrer also explained that the fleet renewal wouldn't hinder the operational capacity of the airline since the 737NGs will be removed when the new 737 MAX 8s join the fleet.

The accelerated return of the Boeing 737NGs will allow the South American low-cost to finish the year 2019 with 24 and the year 2020 with 34 Boeing 737 MAX 8 aircraft in its fleet.

By 2023, more than 40% of the airline's fleet will be comprised of 737 MAXs. The operator has ordered 135 MAX family jets, including 30 737 MAX 10, which will be the largest 737 of all time, capable of transporting up to 230 passengers.

Compared to GOL's current 737-800s, the new 737 MAX 8s are 15% more fuel-efficient. The company expects an increase in profitability up to 24% in the next five years.

In addition to savings in fuel consumption, the 737 MAX 8 will allow GOL to diversify its network and operate international flights to the United States and Mexico thanks to its extended flight range, the company said.