The Alabama plant already has an A220 assembly line and an 320 assembly line. They are adding another A320NEO line and have stated that, if the MRTT is selected by the USAF they’ll add a fourth A330:assembly line…
With A320 production alone ramping up to 75 aircraft a month from the present 50 vs Boeing 737 stuck at 35 and the 777X and 787 in limbo, if even 50% of the extra aircraft are assembled in Mobile, then production there could soon exceed that of Seattle.
https://www.madeinalabama.com/2022/0...ckheed-martin/
https://alabamanewscenter.com/2022/0...ore-a320-jets/
https://airwaysmag.com/airbus-ramping-up-alabama/