Some of the comments on YouTube are a real hoot !
It's so obvious its a chemtrailer jet it doesn't even have a logo on the tail !
In passing, a substantial amount of the Italian airline fleet is also registered out of the country (Irish registrations are a favourite), including brand-new aircraft for Alitalia etc, and this has been the case for some time. I gather there is some Italian bureaucratic or legal issue that causes this to happen. Can anyone identify what this is?