Boeing has completed firm configuration of its B737 MAX 10, meaning engineers now have all the design requirements in place for what will become the largest member of its single-aisle family.

Making the announcement at the Singapore Airshow, Randy Tinseth, Boeing Commercial Airplanes’ vice-president, marketing, said the MAX 10 will use a stretched fuselage 66 inches longer than the MAX 9, and that it would now move into the detailed design phase prior to the start of production. The 230-seater aircraft, launched at the Paris Airshow last year, has more than 416 orders and commitments from 18 customers, with deliveries scheduled to begin in 2020.

Tinseth commented in a briefing in Singapore: “There’s a place in the market for both the MAX 9 and the MAX 10.”

The manufacturer’s first MAX 7 rolled out of the paint hangar earlier this week and will soon start flight tests. The MAX 8 has been in service since 2017, with the first MAX 9 scheduled for delivery in the next few weeks.