The San Francisco Bay Area's intercity air transportation system can move transcontinental goods from airport to airport in less than 6 hours. However, congestion on the Bay Area's regional highway system significantly increases the door-to-door travel time. This study shows that using water transit instead of trucks at peak periods in two primary air express markets would save shippers 20 to 50 min of travel time. The calculated additional cost for each min of savings is $0.003 to $0.01 per air express package. Using water transport for midday air cargo drayage increases costs over the air express component, but may be justified for logistical reasons. Constraints to implementation include environmental, jurisdictional, and labor issues.