1. Manmade airborne clutter such as drones
2. Natural airborne clutter such as birds
3. Natural atmospheric phenomena such as ice crystals
4. Manmade space objects such as satellites
5. The planets Venus or Mars
6. Aberrations such as light reflecting on a cockpit window
7. Psychological or perceptional factors
8. Secret military technology such as advanced aircrafts
9. Foreign experimental or spy technology
10. Extraterrestrial life
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