Six years late, and finally cleared.

The FAA signed off on the 737 MAX 10 on Tuesday. It’s the largest jet in Boeing’s best-selling family, seating up to 230, and it was originally due to fly in 2020.

What happened in between: two fatal MAX crashes, an overhaul of FAA certification and an engine anti-ice problem kept pushing the date back.

This isn’t a niche plane. The MAX 10 makes up more than 30% of the 737 MAX order book. The approval also starts a clock for the wider fleet.

From October 2027, new 737s must carry enhanced angle-of-attack and crew-alerting protections, and existing MAX jets must be upgraded by October 2029.

Passengers will have to wait a bit longer: service is expected to start in spring 2027.