Flight cancellations have mounted as the government shutdown stretches into its second month, causing headaches for travelers nationwide.

More than 7,000 flights on Sunday “within, into, or out of” the country had been delayed, according to flight-tracking website FlightAware. The number of cancellations for flights “within, into, or out of” the country topped 2,200, the website said.

Airports including Hartsfield-Jackson Atlanta International Airport, Newark Liberty........

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