The following information on the aircraft equipment and personnel of the transport companies operating regular air lines in the various European countries has been compiled by the Civil Aviation Department of the Air Ministry and was issued as an appendix to the Official “Resume of Commercial Information” Series 5, No. 3, dated March 7th, 1932. The information gives the position at December 31st, 1931.
(1932), "Commercial Aircraft in Europe: Details of the Numbers of Operating Personnel and Aircraft Types in Use by Various Companies", Aircraft Engineering and Aerospace Technology, Vol. 4 No. 9, pp. 236-238. https://doi.org/10.1108/eb029595
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