This Friday the 15th is a monster travel day out of Boston. Almost every flight on every airline is showing zero availability.

I'm on the 4:10pm BOS-DTW. It's zeroed out on Carlson-Wagonlit's availability tool. However, when I look on NWA.com, the seat map shows almost 30 open seats. Other BOS-DTW that afternoon are similar. I know seats are not always assigned at booking, but 30 seats seems like a lot for a "zeroed out" flight.

Any insight?

RFD,
GA