MIAMI — United Airlines says it will begin flying its new Embraer E175 regional aircraft as United Express this May.

Starting May 17, United will launch the E175 on flights between Chicago O’ Hare and Washington Regan, and on May 19, United will launch the E175 on flights between Chicago and Boston.

The E175 is the newest addition to the United Express fleet. The aircraft boasts a roomier cabin and 76 seats. There will be 12 seats in United First, 16 seats in United Economy Plus, and 48 seats in United Economy. Skywest Airlines and Mesa Airlines will operate these flights.

Last year, Skywest announced a $4 billion order of new Embraer jets while United announced a $840 million order of Embraer jets (to help finance the aircraft for Mesa).

When United placed its large order for the new regional jets, it came with the understanding that they’d be flown by SkyWest under the United Express brand.

United says its E175s will offer “more personal space for customers, with wider seats and aisles than other regional aircraft. Each United First seat features a power outlet. The aircraft’s large overhead bins can accommodate standard carry-on bags, resulting in more convenience for customers.”

“Our customers tell us they value comfort and convenience in an in-flight experience,” Jeff Foland, United’s EVP of marketing, technology and strategy, says in the statement. “The addition of the E175 to the United Express fleet enables us to maintain and better serve our customers, particularly in regional and in high-frequency business markets, as we build a flyer-friendly airline.”

United also says its E175s will be used to to phase out “less efficient regional aircraft from the fleet. The E175s consume less fuel per seat and have fewer CO2 emissions per seat than the aircraft they replace.”