"JetBlue flights have been severely delayed or canceled since Friday due to weather impacts on the East Coast and in the Midwest as well as new Federal Aviation Administration guidelines about how much rest pilots must now have."

...and so it begins.
Expect to hear this language appended to each and every airline generated statement regarding degradation of service, regardless of cause.

JetBlue To Halt All Flights To And From Boston, NY, NJ « CBS Boston