When I look at an aircraft, the section "Owner" show sometimes his adress when it exists, perhaps, but never itself. Why ?

The owners name and address of privately held aircraft are not shown.

Early in this website's history there was in incident with an aircraft owner that was unhappy about seeing a photo of their aircraft on this website. So as a compromise, owner's name and street address of privately held aircraft are not shown.

Most of the regular poster's here have had an angry email from an aircraft owner. If you get one, it's just best to remove the photo and move on. You've done nothing illegal by taking a photo and posting it online. But if somebody is offended it's better to delete the photo.

If you're truly interested in the owner of an aircraft, the FAA's website will display this information.

a month later

I am not an interest for the real owner of an aircraft, but by the name of the operator. Sometimes I see the operator in your database, but with an attribute ahead. I don't remember it.

I am sorry for my language, it is not my root. I'm French.

Regards

Check out airframes.org they usually show the operator or for British registrations the CAA's GINFO data base which will give you the aircrafts current and previous owners.

Neil