United also said it will grow its total inventory of domestic first-class and Economy Plus seats by approximately 75% compared to its 2019 level as it replaces 200 single-cabin, 50-seat regional jets with mainline narrowbodies.
Specifically, Tuesday's order includes 150 Boeing 737 Max-10s, 50 of the smaller 737 Max-8s and 70 Airbus A321neos. United said the aircraft will be delivered with a new "signature interior," including seatback entertainment at every seat and enough overhead bin space to accommodate one bag for every passenger. United plans to retrofit all of its older narrowbodies with the new interiors by 2025. United chief commercial officer Andrew Nocella said economy seating won't become tighter when interiors are overhauled.