I was on AA 1010 from PBI to LGA last night. We were originally supposed to take off at 7:04, but because of thunderstorms in Florida that morning, the plane was delayed all day and had yet to return from LGA. So, take off was pushed to 9:20. The GA said that they needed a very quick turn around when the plane landed because there is a curfew at LGA, and if we didn't take off by 9:20 they would have to cancel the flight.

Is there really a curfew at LGA? I've never heard of this.