 However aviators 1st Lt. Torrey H. Webb and 2nd Lt. James C. Edgerton completed the scheduled southbound relay with 144 pounds of mail, and Edgerton then flew Boyle's mail to Philadelphia the following day.The site of the first continuously scheduled air mail service is marked by a plaque in West Potomac Park in Washington, D.C..The route was extended to Boston three weeks later on June 4.