My point was that by scheduling the aircraft for continuous service with short connections (as described by MFLetou), JetBlue is setting up the dominoes for cascading delays. Especially when the airline decides to fly rather than cancel, and especially when the airline does not have enough reserve aircraft. Once the weather or an extra fuel stop causes a problem, that problem persists for a LONG time.

Compare this to the situation at Southwest, where all aircraft are idle from roughly midnight to 6 AM. The previous day's problems rarely affect the current day's operations, and there is enough time for maintenance. The nightly shutdown acts as a fire break against cascading delays.

That said, it's rumored that Southwest will begin red-eye flights within a year or two. As long as they are a small percentage of operations, the incidence of cascading delays should be minimal.