On Wednesday, Boeing (BA -2.87%) announced the crossing of an arbitrary, but still impressive threshold. In its effort to retain its title as maker of the best-selling aircraft ever, Boeing has just booked a deal to sell 60 "MAX" variant 737 airplanes to Aviation Capital Group.

The order, which consists of 50 737 MAX 8 aircraft and 10 larger 737 MAX 9s, was finalized last month, and brings Boeing's record to more than 1,000 737 MAX aircraft ordered to date, 1,029 to be exact in just over a year since the first order. At list prices -- which are usually steeply discounted -- the 60 planes are said to be worth $6 billion.

In a statement, Boeing said that when equipped with the LEAP-1B engine from General Electric (GE -2.11%) joint venture CFM International, the 737 MAX offers fuel efficiency sufficient to cut operating costs to 8% below the costs of Airbus' rival A320neo.

ACG is a global commercial jet aircraft leasing and asset management company that owns and manages a portfolio of 240 single- and twin-aisle commercial jets

Boeing shares had risen 1.7% as of this writing, to $76.63.

link