Delta has communicated a lot on the arrival of its first Boeing 747-400 (with some A330 too, all related to acquisition of Northwest), in particular with this movie that has been seen a lot and where we could see how the plane was painted:

747-400 in Delta Colors

But in fact, this is not the first Boeing 747 for Delta. Indeed, the super-jumbo has joined the fleet of the company on October 2 1970, soon joined by 7 other planes. Very quickly abandoned, because the 747-100 was not adapted to the the Delta traffic at this time (Caribbean and Canada).

For the anecdote, the upper deck was actually a suite. It was enough to take 7 first class tickets  to afford the luxury of this space.