https://ia601004.us.archive.org/21/items/united-updated-guide/A_UpDaTeD_List_Of_United_Airlines_TM_Service_Numbers_Guide.pdf
https://ia601004.us.archive.org/21/items/united-updated-guide/A_UpDaTeD_List_Of_United_Airlines_TM_Service_Numbers_Guide.pdf
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