Lufthansa's Ju-52 also does revenue flights (I think LH publishes a schedule and you can book via their website), was built around 1936, and served with Lufthansa and the Luftwaffe amongst many operators.
And as a divertisement: what would be the highest houred commercial aircraft still in service? A decade or two ago a Provincetown-Boston Airlines DC-3 had a phenomenal number of hours on the airframe - something like 150,000 if I recall. Some of BA's 747-136s were over 100,000 when they were retired. Anyone know of more...?