In February USA Trade Online began adding port-level data to their database. In our area that includes the ports of New York City, Newark and JFK International Airport (airports are considered ports too). This means you can track import/export activity through a particular port. It might be interesting to see what is flowing through New Orleans today.
Data is available at the 6-digit level and is updated monthly. Historical statistics will be available from 2003 to the present. For more detail, see the February issue of STAT News.