At 11.34am approximately, a plane identified as Korean Airlines KAL130 using Flightradar24.com in real time, was seen emitting an aerosol trail which persisted and expanded over time. The photos show the trail being sprayed at 11.34am approx, then the same trail is shown dispersing at about 11.40am and 11.46am.
Flightradar24.com shows that this plane was at an altitude of approximately 26,000 feet at the time.
This is not the first time the Korean Airline has been caught spraying aerosols in this region. Refer: