Retaliation? United adds flights to Delta hubs

United Airlines is adding new routes to the key hubs of one of its biggest rivals. Starting April 1, United will add nonstop flights between San Francisco and Atlanta and between Los Angeles and Minneapolis/St. Paul. The carrier will fly two daily round-trip flights on each route. Atlanta and Minneapolis are two of the biggest hubs of Delta Air Lines, the nation's No. 2 carrier. United is the USA's biggest airline. (www.usatoday.com) 기타...