Definitely chemtrail.

A contrail dissapears in 30 seconds and the trail is short.

There's a contest for chemtrail pics. Add "Daily Dose Phase 7" in your title somewhere, use a "dailydose" tag and post your link in the comment section here...

https://steemit.com/dailydose/@inthenow/the-daily-dose-challenge-phase-7-is-now-live