(Correction: Boeing projects 14 percent fuel savings for the MAX compared with the current Next-Generation 737, not 20 percent.)
Boeing has started building the wings for the newest model of its popular 737 single-aisle jet. It competes with the Airbus A320neo.
The first 737 MAX is scheduled to begin flight tests next year and be delivered in 2017. The MAX will use new engines, and Boeing says the jet will use 14 percent less fuel than the current 737s, known as Next-Generation.