Thousands of flights within, into, or out of the United States were canceled or delayed on Jan. 16 and 17 as winter storm Izzy battered the southeastern United States with heavy sleet and snow, knocking out power to tens of thousands of households. A total of 3,059 flights within, into or out of the United States were canceled Sunday, while 5,056 flights were delayed, according to FlightAware data. Flight interruptions continued into Monday, with 1,516 cancellations within, into, or out of the United States, and over 1,239 delays, at the time of reporting. Izzy’s snow and ice pounded parts of the Midwest on Friday and Saturday, before spreading south on Sunday, prompting multiple states to issue winter storm warnings, including Georgia, Virginia, North Carolina, and South Carolina. Georgia Gov. Brian Kemp said on Sunday that people should avoid non-essential travel in areas hit by the storm. “If you’re able tonight …