Lyon 2013 aircraft contrail observation

Summary

On December 15, 2013, a witness in Lyon observed a black dot with two orange trails moving across the sky. The phenomenon disappeared over the horizon. The witness recorded the event and shared it online. Despite clear weather conditions, the trails were identified as aircraft contrails at high altitude. The estimated distance ranged between 20 and 100 kilometers. The video left no doubt about the nature of the phenomenon. The GEIPAN classified the case as "A", meaning a certain observation of contrails.