Advise how to distinguish a UFO from a known flight object

Make sure the object is not one of those:
- Illuminated party balloons in the dark
Model hot air balloons
Weather and stratospheric balloons
Reflections of Clouds on Skybeam
Navigation lights of airplanes and helicopters
Iridium flares
Missiles or their re-entering the atmosphere in amplifiers
Experimental aircraft and UAVs novel designs
Lenticulariswolken
ball lightning
meteors




UFOs are quiet often mistaken with one of the objects listed above. 
If you can exclude that your UFO is one of those please write (if possible with pictures to info@alien-news.org) .