The survey was looking to see whether there would be food on board during a tarmac delay.

CNN: Delta one of top airlines to get an 'F' in report

If the tarmac delay is more than an hour, the airline must provide air conditioning, use of toilets and water.

BBC: EU unveils new air passenger rights

For domestic US flights, the tarmac delay limit is three hours.

BBC: US strengthens airline passenger rights

It gives Europeans tarmac-delay protections.

WSJ: The Middle Seat: Passenger Rights? What Passenger Rights?

JetBlue Airways Corp. had six diverted planes on the ground, and jetBlue officials said all its captains were acutely aware of the tarmac-delay rule, which threatens heavy fines on airlines if they keep passengers on board grounded domestic flights for more than three hours (four hours for international) without offering a chance to deplane, with certain exceptions.

WSJ: How Snow (and Libyan Soldiers) Led to Airport Logjams