Heavy backlogs make it hard for airlines to shift orders to Airbus, the only other large commercial aircraft manufacturer globally. Alaska Airlines also said its 2024 capacity plans were still in flux due to the Boeing crisis. The airline does not expect to get all of the 47 planned aircraft deliveries from Boeing over the next two years, CEO Ben Minicucci said. Boeing said on Tuesday it is adding weekly compliance checks for every 737 work area and additional audits of equipment to reduce quality problems.