Most mail moves by surface transportation modes. As materials handling systems and intermodal transportation capabilities improve, mail moving more than 600 miles should go by air. 1.4 billion ton-miles of traffic a year are waiting for an imaginative and economical air transportation proposal. The U. S. Postal Service has been pushing hard to get more mail in the air, despite strong opposition or lack of interest by airlines. The time for an intensive marketing approach to mail, by airlines, is overdue.