Airlines canceled over 2,700 U.S. flights on Sunday as a winter storm combining high winds and ice was poised to hit the U.S. East Coast over the holiday weekend. The flights canceled by 12:30 p.m. ET on Sunday included over 2,700 entering, departing from, or within the United States, according to flight tracking website FlightAware.com. Over 1,500 flights were delayed, the data showed. American Airlines Group Inc. had over 600 flight cancellations. Almost 95 percent of the flights out of Charlotte Douglas International Airport in North Carolina, an American Airlines hub, were canceled, the FlightAware website showed. American Airlines is allowing customers affected by the weather to rebook flights without a fee. A major winter storm will impact the eastern United States on Sunday into Monday, the National Weather Service said. The highest snowfall totals were expected along the spine of the Appalachians as well as across the lower Great …