But isn't there a 'Minimum Takeoff Fuel' amount listed in the dispatch release?
I'm sure there is, but....
Reports also indicated the plane ran into nasty storms en route to Miami.
A airborne reroute or holding because maybe Washington Center (or insert any other center here) flipped out and won't take anyone due to everyone having to deviate around storms could end up putting you close on gas if you didn't bring any contingency or extra fuel.