Pp 228 pages, A4 format describing wartime airmail routes all over the world. Superb route maps and each route section includes a table of all flights on that route during this period, where known, not just the First Flight. The dates of all intermediate stops are included as well as well as the flight number or name of plane. Historical and aerophilatelic information is provided in detail. Many actual flown covers are shown and each chapter includes a bibliography for further study.