There are still DC-3s flying and making money for small airlines. Take a lot more than a 40-year run to beat that record.
I worked for Trans-Texas Airways ‘63-’65, at Dallas Love Field. DC-3s were the main fleet. Most of the aircraft had placards showing they were made in 1935-37, over 80 years ago. ..........Designated as C-47s for the military in WW II, they were workhorses!
I recall a DC-3 flight from Lashio, Burma to Rangoon in 1985. The plane was filled with tattooed Shan tribals, one of whom was carrying a cerise colored orchid as big as a dinner plate. The seats were barely bolted and the floorboard was holed. When I left the plane I checked and found that it had been produced in 1935. Fifty years and still going! I wouldn’t be surprised if it was still in use today.

I jumped in my car and drove up the road, and saw this in a large field:

I have heard that the airframes on these are so robust that they have actually retrofitted them with turboprop engines...:)
Love it. Just love it.