 While the USPS no longer offers traditional letter Air Mail, it does provide various classes of "premium" domestic and international business, priority, and express Air Mail services with guaranteed delivery times at much higher rates.In June 2006 the USPS formally trademarked "Air Mail" (two words with capital first letters) along with Pony Express.The first experimental foreign Air Mail flight from the U.S. was made by Eddie Hubbard and William E. Boeing while on a survey flight to Vancouver, British Columbia, on March 3, 1919.