Boeing [NYSE: BA] today announced a commitment for 30 737 airplanes from an unidentified Chinese customer at the 2016 Farnborough Airshow.

The commitment includes a mix of 737 MAX and Next-Generation 737 airplanes, valued at more than $3 billion at current list prices.

“The agreement demonstrates the confidence the market has in the 737 family of airplanes,” said Boeing Commercial Airplanes President and CEO Ray Conner. “The new airplanes will bring the leading edge of passenger comfort, efficiency and reliability in the single-aisle market to our customer.”

The 737 MAX incorporates the latest technology CFM International LEAP-1B engines, Advanced Technology winglets and other improvements to deliver the highest efficiency, reliability and passenger comfort in the single-aisle market. The new single-aisle airplane will deliver 20 percent lower fuel use than the first Next-Generation 737s and the lowest operating costs in its class – 8 percent per seat less than its nearest competitor.

Boeing press release