United Airlines continues to expand as it's taken delivery of five Boeing 737 MAX 9 jets in just seven days (or in essence, one 737 for every workday). We're seeing not just aggressive growth on United's part (which has positioned the 737 MAX front-and-center in its ambitions), but also improvements in production flows from Boeing.

After today's deliveries, United is beginning to reach a milestone. CH-Aviation shows that United currently has 136 Boeing 737-900ERs in service, the predecessor to the 737 MAX 9. With these new deliveries, the 737 MAX 9 fleet amounts to 111, and with 114 remaining on order, we will soon see the 737 MAX 9 fleet surpass the 737-900ER fleet in size.

United's Fleet Transition

United has long relied on the 737NG for its operations, in particular, the 737-80

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