| YEAR | COUNTRY | NOTE |
| 1896 | California, USA | Airship Mystery |
| 1897 | Midwest, USA | Airship Mystery |
| 1909 | England, Australasia | Airship Scare |
| 1914 | South Africa | |
| 1932/33 | Scandinavia | Ghost Flyers |
| 1944/45 | Western Europe | Foo Fighters |
| 1946 | Scandinavia | Ghost Rockets |
| 1947 | Northwestern USA | Flying Saucers |
| 1950 | South America | |
| 1952 | Eastern USA | UFOs |
| 1954 | France | |
| 1958 | Japan | |
| 1959 | Papua New Guinea | |
| 1960 | New Zealand | |
| 1962 | Brazil | |
| 1964 | USA | |
| 1965 | Midwest, USA | |
| 1967 | United Kingdom |
| 1968 | Spain | |
| 1970 | Malaysia | |
| 1972 | South Africa | |
| 1973 | South America | Second Front: Southeast USA |
| 1975 | USA | |
| 1977 | United Kingdom | |
| 1978 | Italy | |
| 1979 | Philippines | |
| 1982 | South America | |
| 1985 | Italy | |
| 1988 | United Kingdom | |
| 1988/89 | Belgium | |
| 1991 | Mexico | |
| 1993 | Israel | |
| 1996 | United Kingdom | |
| 1999 | Malaysia | |