Dow Jones Transportation Average (DJTA), also known as the Dow Jones Transports, is the oldest U.S. stock index still in use. Originally solely composed of railroad companies, DTJA now also includes airlines, delivery services and logistics, trucking and marine transportation stocks.
Analysts measure the Dow Jones Industrial Average (DJIA) against the DTJA to confirm the U.S. economy’s health. Some even look to transportation and shipping stocks as market forecasters.