MOBILE, AL—An expansion project that will double the production space at Airbus’ assembly plant here is passing key milestones as it moves forward on schedule for completion next year.

Airbus recently held a “topping out” ceremony for a new A320 final assembly line (FAL) that’s under construction as the centerpiece of the expansion project, which launched in 2022. “Topping out” means that the last structural steel supports for the building have been installed, and the building can now be “topped” with exterior skin. Underground media channels and production floor slabs are in progress, and the building is expected to be ready for jigs and tools later this year.