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Dear Mr. Weber,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Gorrell's History of the American Expeditionary Forces Air Service, 1917 - 1919. When the records were microfilmed as M990, a descriptive pamphlet was written that provides a brief description of the contents & volumes and arrangement of the records that may be helpful to you. For more information, please contact the National Archives at College Park - Textual Records (RDT2) via email at firstname.lastname@example.org.
We hope this information is helpful. Best of luck with your family research!