Originally Posted by number_6
No airline used the top deck for a lounge after the SUD (stretched upper deck) was introduced. All of the non-SUD 747s have been scrapped by now. The original 747 had space for only 4 seats upstairs, thus the desire to use it as a lounge instead. I think one airline used it as crew quarters, not for pax use. This was before they got the crew quarters in the tail on the later 747 designs.
1. There are still some non-SUD 747s flying for JAL and NW and (I believe) ANA.
2. The classic 747s have room for way more than 4 seats upstairs. More like 30-40 coach seats or (in the case of NW) 12 first class seats (now sold as business class) at 70 inches of pitch.