Commercial jet traffic leave very few, if any persistent contrails. So-called chemtrails are way higher in altitude (flight level 450+). So high that you can barely discern an aircraft at the point. Also chemtrail aircraft make X patterns in the sky. Typically they also run several aircraft in an area. Also making X patterns. According to several sources, this program is run by the U.N. There is a big difference between airlines and cargo and the chemtrail aircraft. This MIT program is smoke and mirrors IMHO.