Due to the extreme heat LaGuardia Airport experienced a power outage yesterday night and power problems are still persisting into today. From NY1,
"Some flights had to be canceled at LaGuardia Airport Tuesday and others delayed due to a power outage in Terminal A and parts of Central Terminal B in what appears to be a continuation of Monday's troubles.
The outage is affecting passengers traveling on Delta and American Airlines. Passengers are advised to call ahead if headed to the airport.
American Airlines says it is offering limited service in and out of LaGuardia. No Delta shuttle flights are departing, but they are arriving."
More from NY1 on the story.