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Dear Mr. Blum,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the following series: Rate Orders and Related Records, 1937 - 1958; Correspondence Relating to Air Mail Service, 1918 - 1937; Orders Relating to Ocean Mail Service, 1928 - 1941; Performance Reports on Foreign Airmail Service, 1938 - 1939; and Correspondence Files Relating to International Postal Matters, 1917 - 1961 in the Records of the Post Office Department (Record Group 28) that may contain the information you seek. For more about these records, please contact the National Archives at Washington, DC - Textual Reference (RDT1) at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!