Licensed 34 Unlicensed 166 200 _Pilots Involved in Accidents_ Licensed pilots 35 Unlicensed pilots 165 200 _Probable Causes of Accidents_ Pilots 100 Mechanical defects 43 Structural failure 23 Weather 12 Other causes 14 Unknown 8 200 _Kinds of Flying Engaged In_ Miscellaneous 139 Student 23 Experimental (including trans-oceanic) 23 Demonstration 3 Air transport 12 200 _Fatalities—Various Causes_ Pilots 79 Mechanical defects 22 Structural failure 22 Weather 9 Other causes 13 Unknown 19 164 _Fatalities in Post-Office Air Mail Operations_ ========================================================== | | | Fatalities | | Calendar | Miles |---------------------| Miles per | Year | | Pilots | Passengers | Fatality |----------+-------------+--------+------------+------------ | 1927 | 1,413,381 | 1 | 0 | 1,413,381 | 1926 | 2,583,056 | 1 | 0 | 2,583,056 | 1925 | 2,521,758 | 1 | 0 | 2,521,758 | 1924 | 2,161,077 | 3 | 0 | 720,359 | 1923 | 1,870,422 | 5 | 1 | 374,084 | 1922 | 1,756,803 | 1 | 0 | 1,756,803 | 1921 | 1,912,733 | 7 | 2 | 273,248 | 1920 | 1,048,444 | 8 | 6 | 74,886 | 1919 | 461,295 | 4 | 0 | 115,324 | 1918 | 102,548 | 1 | 0 | 102,548 ----------+-------------+--------+------------+------------ | Total | 15,831,517 | 32 | 9 | -----------------------------------------------------------