On April 11, 2004, 24-hour service was added to the B15 between Brooklyn and JFK Airport. At the same time, service to all JFK terminals except Terminal 4 was replaced by a free transfer to the AirTrain JFK. On October 12, 2009, buses on the B15 were equipped with luggage racks, as part of a ten-bus pilot program on airport bus services to improve passenger flow. On May 30, 2012, due to construction at Terminal 4, the B15 started terminating at a new stop at Terminal 5, near the former Terminal 6. On September 8, 2013, B15 buses stopped directly serving the Brooklyn General Mail Facility loop due to low ridership.