Hi, I’m trying to find some historical data on the dates that aircraft were owned by a particular owner. I have the tail numbers and the owners name but I’m unable to determine the dates of ownership. The time frame I am looking for is 1975 through 1985. The owner was my father who recently passed away so this will be for a memorial I’m working on. Any advice of where to search would be helpful. The FAA records on line at least don’t seem to go back that far.