Travelers just ranked the best airlines in America, and one major carrier slipped badly

Delta Air Lines has become the new go-to carrier that American travelers consider when purchasing a flight, leapfrogging rivals American Airlines and United Airlines, according to an annual study released this week by YouGov. In addition to moving up the ranks for travelers considering future ticket purchases, the Atlanta-based airline also landed at the No. 1 spot for quality and beat out the three other largest U.S. carriers—American, United, and Southwest Airlines—for satisfaction among cu...