Les avis peuvent bien sûr diverger sur cette question, mais on peut citer le classement suivant, synthèse d'autres classements :
| Cas | Année | Type (Hynek) | Étrangeté (/5) | Indices | Enquête | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| enregistrés | physiques | constatés | ||||||||||
| Radar | Film | Photo | Résidus | Traces | Visuelle | EM | Non identifié | Identifié | ||||
| Trindade | en | DD | 4 | 0 | 0 | 4 | 0 | 0 | 48 | 0 | ||
| Minot | en | DD | 3 | 2 | 0 | 0 | 15 | 1 | ||||
| Lakenheath | en | LN | 2 | 4 | 0 | 0 | 0 | 0 | n | 0 | Condon, Gordon D. Thayer (AIAA) | |
| RB-47 | en | RR2 | 2 | 2 | 0 | 0 | 0 | 0 | 6 | 0 | McDonald | |
| Tehéran | en | RR2 | 3 | 3 | 0 | 0 | 0 | 5 | 3 | DIA | ||
| Cocoyoc | en | RR2 | 3 | 0 | 0 | 3 | 0 | 0 | 3 | 0 | APRO, MUFON | |
| Great Falls | en | DD | 2 | 0 | 1 | 0 | 0 | 0 | 2 | 0 | ATIC, Condon | |
| McMinnville | en | DD | 4 | 0 | 0 | 2 | 0 | 0 | 2 | 0 | Condon, Maccabee, McDonald | Klass, Antoine
Cousyn / François Louange |
| Chauvet | en | DD | 4 | 0 | 0 | 4 | 0 | 0 | 1 | 0 | Pierre Guérin | Antoine
Cousyn/ François Louange |
| Duboc | en | RR1 | 3 | 1 | 0 | 0 | 0 | 0 | 3 | 0 | SEPRA | |
| Vancouver | en | DD | 3 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | Haines | |
| Levelland | en | RR2 | 2 | 0 | 0 | 0 | 0 | 15 | Oui | Hynek, Lagarde | ||
| Chesapeake Bay | en | DD | 2 | 0 | 0 | 0 | 0 | 2 + (6 + 2) | 0 | Blue Book | Menzel | |
| Boianai | en | RR1 | 3 | 0 | 0 | 0 | 0 | 38 | 0 | McDonald | ||
| Fort Itaipú | en | RR2 | 3 | 0 | 0 | 0 | 2 | 2 + n | 1 | |||
| Vol 117 | en | RR1 | 2 | 0 | 0 | 0 | 0 | 14 | 0 | Keyhoe, McDonald | ||
| Coyne | en | 2 | 0 | 0 | 0 | 9 | ||||||
| Betty & Barney Hill | en | RR1 + RR3 | 3 | 0 | 0 | 0 | 0 | 2 (hyp) | 0 | |||
| Exeter | en | 3 (plusieurs policiers) | ||||||||||
| Ravenna | en | 2 | plusieurs policiers | |||||||||
| Fogarty | en | multiple RV | 2 | 1 | ||||||||
| Lubbock | en | LN | 1 | 5 | 0 | |||||||
| Tremonton | en | DD | 1 | 0 | 1 | 0 | 0 | 4 | 0 | GSW | Harold P. Robertson , William K. Hartmann , (Edward J.
Ruppelt )
|
|
| Soccorro | en | RR3 | 4 | 0 | 0 | 0 | 1 | 1 | 0 | |||
| Washington (DC) | en | 2 | 2 | 0 | 0 | Crow, Loren W. | ||||||
| Mont Rainier | en | DD | 2 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | ||
| Rapid City | 1953 | LN, RV multiples | 2 | Oui | Condon | |||||||
| Red Bluff | 1960 | |||||||||||
| Willis Sperry | 1950 | RR1 | 1 | |||||||||
| Trans-en-Provence | 1981 | RR2 | 4 | 0 | 0 | 0 | 2 | 1 | 0 | GEPAN | ||
| Kinross AFB | en | RV | 1 | 1 | 0 | 0 | 2 (épave avion + objet non identifié) | 0 | ? | 0 | Keyhoe | |
| Clare Booth Luce | en | RR1 | 2 | 0 | 0 | 0 | 0 | 0 | 1+ 1000s | 0 | McDonald | |
| Goose Bay | en | 0 | 0 | 0 | 2 | 0 | Condon | |||||
| Wilcox dans le New Jersey avec long dialogue | en | RR3 | 5 | |||||||||
| Chiles-Whitted | en | 0 | 2 | |||||||||
| Ubatuba | en | - | 2 | 0 | 0 | 0 | 1 | 0 | (0) | 0 | Craig, Roy F. (Rapport Condon) | |
| Salem | 1952 | RR1 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | |||
| Emil J. Smith | en | RR1 | 1 | 0 | 0 | 0 | 0 | 3 | 0 | McDonald | ||
| Rex Heflin / Santa Anna | en | RR2 | 4 | 0 | 0 | 4 | 0 | 0 | 1 | 1 | ||
| Mantell | 1948 | RR1 | 1 | 0 | 0 | 0 | 0 | n | 0 | |||
| Roswell | en | - | 2 | 0 | 0 | 0 | n | ? | >= 2 | 0 | Bourdais (HET), Friedman (HET) | Jeffreys |
Références :
- Vallée, J. & J. "Survey of 29 U.S. UFO organizations (about 13 responding) of most significant or convincing UFO sightings", Challenge to Science, 1966
- Story, Ronald et Greenwell, J. Richard. "October 1979 survey of 90 leading UFO researchers (33 responding) strongest UFO evidence on record", UFOs and the Limits of Science, 1981