The tracking website Flightaware.Com estimates 2,197 flights were cancelled nationwide as of yesterday afternoon. That follows two days of similarly difficult travel conditions.
Cold weather has affected much of the country, but hit Dallas-Fort Worth International Airport particularly hard. The airport said more than 400 departures were cancelled yesterday.
It is also still trying to clear out thousands of travellers who have been sleeping at the terminals or in nearby hotels waiting for a flight out since Thursday night.
"We are trying to keep the mood light and do everything we can to make sure that our passengers have as good an experience as possible given the situation," airport spokesman David Magana said.
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Cold weather turned the region into an "ice rink" Thursday night, he said. That forced 3,000 people to stay the night Thursday, and the figure swelled to 4,000 Friday. As flights began to slowly resume, that figure dropped to 2,000 for Saturday night.
American Airlines, which has its main hub in Dallas Fort Worth, said it had 1,100 cancellations across its system yesterday. It expects 550 cancellations for today, the bulk of which are at the Dallas Fort Worth airport.
The airline has updated its travel policy due to the tough weather, allowing passengers who have trips planned through affected areas to change their flights at no charge to avoid some of the complications.
Philadelphia International Airport spokeswoman Stacey Jackson said there was much more snow and ice than originally anticipated for its area.
Initial forecasts of one-half to two inches (1.25 to 5 centimetres) of snow have been upped to four to six inches (10 to 15 centimetres). That led to a temporary ground stop yesterday, which halted any runway activity until the afternoon.