Big Boeing Customer Says It Is Walking Away From New MAX Order

LONDON— Ryanair Holdings PLC, Boeing Co. ’s biggest customer outside of the U.S., said it is walking away from talks with the U.S. jet maker over a potential new order for the 737 MAX in a dispute over pricing.

Boeing has pushed to catch up with rival Airbus SE on jet orders from airlines and lessors, after falling far behind in the crucial single-aisle category. The 737 MAX competes with Airbus’s A320 in that market, and Airbus capitalized on the MAX’s nearly two-year grounding to boost its market share.