By David Shepardson WASHINGTON (Reuters) -U.S. airlines canceled 1,460 flights on Day 2 of government-mandated flight cuts across the country and thousands of flights were delayed, causing mounting travel woes as air-traffic-controller absences spiked amid the federal government shutdown. The Federal Aviation Administration on Saturday reported major air traffic control staffing issues, impacting 37 airport towers and other centers and delaying flights in at least 12 major U.S. cities — including Atlanta, Newark, San Francisco, Chicago and New York. Some 6,000 flights were delayed on Saturday, down from Friday when 7,000 were delayed and 1,025 were canceled. The FAA had instructed airlines to cut 4% of daily flights starting on Friday at 40 major airports because of air traffic control saf

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