First Transcontinental Automobile Trailer Mail Cover; 1936-1939

Quote:
FIRST TRANSCONTINENTAL AUTOMOBILE TRAILER MAIL
This mail, originally intended to be flown from Dallas to Paris on the Mason-Pangborn Trans-Atlantic Flight, has, through failure of certain plans to materialize as anticipated, resulted in becoming undoubtedly the First Transcontinental-Trailer Mail.
Over eight months of intensive effort and an expenditure of many thousands of dollars in excess of the relatively lull sum received from the special philatelic mail, was expended in a most sincere effort to complete the Dallas-Paris flight. After unexpected cancellation of the Texas Centennial Exposition's sponsorship, on July 10th, 1936, many contacts were made, without success, in New York, Cleveland and other cities, endeavoring to secure financial sponsorship and to carry on with the flight.
As a result, this philatelic mail has been carried across the entire continent in an automobile trailer from New York to Daytona Beach and Sarasota, Fla., Now Orleans, Dallas, San Antonio and then to Los Angeles, California from where it io being mailed to the addresses.
It is most unique and unusual for mail to be transported in an Automobile Trailer. There were approximately 500 First Cover envelopes carried on this trip, all that were originally received for the flight. Theas covers should therefore have a scarcity value, as well as their philatelic value because of there having been carried as the First Transcontinental Automobile-Trailer Mail.