From CNBC:

Boeing’s Max crisis is prompting airlines like Southwest and Alaska to reassess growth plans due to quality control issues, output delays, and FAA scrutiny. Southwest now expects fewer Max deliveries, impacting capacity and financial projections. United Airlines asked Boeing to halt Max 10 production for more Max 9s certified by the FAA. Airlines express frustration over delays and safety concerns, prompting Boeing to strengthen quality control measures and collaborate with employees to address issues.



Read more at CNBC: Boeing Max problems shift growth plans at Southwest, United