My latest graphic post re the "Outbound vs "Inbound" question...
At the contrail science page, if you go to the comments, they have stereoscopic pairs that prove it was inbound.
These pairs are presented not as cross your eyes types, rather you must make the right eye look at the right image and the left eye look at the left image.
I’m quite practiced at looking at stereoscopic pairs and the contrail is clearly inbound.
http://contrailscience.com/los-angeles-missile-contrail-explained-in-pictures/#comments