Alaska Airlines is bringing four new markets to customers in the Rose City. New seasonal service will include Portland-Philadelphia starting May 22; Portland-Milwaukee, Wisconsin, starting June 5; and Portland-Baltimore starting June 6. New nonstop service between Portland-Albuquerque will start Aug. 18 and operate year-round. Flights between Portland and Philadelphia and Portland and Baltimore will be operated with fuel-efficient Boeing 737 aircraft. Flights between Portland and Milwaukee will be operated by SkyWest Airlines and flights between Portland and Albuquerque will be operated by Horizon Air. Both carriers will serve the routes with 76-seat E175 jets, which feature 12 seats in first class, 12 seats in premium class and 52 seats in the main cabin. The E175 boasts cabin dimensions on par with a narrow-body jet.