United Airlines on Monday that it will begin nonstop service from its Los Angeles and San Francisco hubs to Atlanta and Minneapolis-St. Paul, which happen to be Delta Air Lines hubs. The announcement comes out six days after Delta announced new nonstop flights from its Seattle gateway to Los Angeles and San Francisco, plus Las Vegas. United said it will have two daily non-stops between San Francisco and Atlanta and between Los Angeles and Minneapolis-St. Paul. http://aviationblog....elta-hubs.html/