SF,
I just came across a similar offer to Miami from NY, round trip for under $100. Who'd fly that though.
My GF loves these fares, a she's a world traveler and is thrifty in the process. In December we took a Holland America cruise to Key West, Grand Turk, Dominican Republic- Amber Cove and Half moon key in the Bahamas from Fort Lauderdale. Airfare included. A Veranda cabin for $769 each for 7 nights. Now I can only imagine what that would cost today, if ships were cruising.