LaGuardia Airport saw more than three times as many flights canceled Sunday compared with Friday — with hundreds more scrubbed at Kennedy and Newark Liberty International airports — as Transportation Secretary Sean Duffy warned that by Thanksgiving, U.S. air traffic could "slow to a trickle" if the federal government remains shut down.

By Sunday afternoon, Day 40 of the shutdown, LaGuardia had seen more than 170 flight cancellations, compared with 57 on Saturday and 48 on Friday, according to the flight-tracking website FlightAware. Newark canceled 234 flights on Sunday, compared with 187 on Saturday. Kennedy Airport saw fewer cancellations on Sunday, with 58 flights scrapped compared with 104 on Saturday.

Across the country Sunday, airline daily cancellations surpassed 2,000 for the fir

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