As of 2:06 pm ET, 1,628 flights within, into, or out of the United States were delayed, according to flight-tracking website FlightAware. The website also reported a total of 95 cancellations within, into, or out of the country today.
The development comes after the Federal Aviation Administration grounded flights to New York's LaGuardia Airport because the smoke from the Canadian wildfires reduced visibility in the area. Newark airport activated the ground stop minutes after that.