American Airlines Group Inc. AAL, +2.19% disclosed Wednesday that it amended its firm orders for Boeing Co.'s BA, +4.05% 737 MAX 8 aircraft to 30, with 15 aircraft scheduled for delivery in 2023 and the rest to be delivered in 2024. The increase comes after the air carrier said it amended its purchase agreement dated February 2013, in which American converts purchase options to buy 23 additional 737 MAX 8 aircraft, and said it plans to convert options this year to buy seven more aircraft.