NEW YORK – Boeing Co. and the commercial aircraft leasing and financing arm of General Electric Co. have agreed on a firm order for 85 737s. The planes are worth $6 billion at list prices, although discounts for major customers are common.

The order includes 75 737 MAX 8s and 10 Next-Generation 737-800s. First announced at the Farnborough Airshow in July, the order allows for the purchase of up to 15 extra 737-800s.

With this order, GE Capital Aviation Services has ordered 580 airplanes directly from Boeing since 1995.