Direct Mail is the most prevalent promotional media. These can be push or pull media. Or you look in the Yellow Pages of the phone book to find a list of transportation companies. Mailing dates are important. Decide on First class vs. Bulk mail.
First class is the best, but most expensive.
Usually arrives in 3-5 days. Bulk is much cheaper, but may take too long to reach your audience. Bulk mail is the last mail that the post office handles. Mailing houses can handle all your mailing needs. See class handout for a list of elements you may want to include in a convention program.