United Airlines was once again faring the worst of the American domestic airlines. Republic Airways, which operates short-haul flights for American Airlines, Delta and United, had 17% of its schedule canceled (153 flights) but few delays. More than 40 million people in the Northeast and Central Plains are at risk of severe storms on Tuesday. United CEO blames FAA staffing for “unprecedented” weekend delaysTuesday’s travel troubles are the fourth day in the row of delays and cancellations. The airline canceled 461 flights this past Saturday and Sunday and delayed another 1,972 flights, according to data from flight tracking site FlightAware.

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