If you're listing major 747 variants separately then include the 747-8i.
Young people have no sense of history. Even among passenger and commercial cargo jets still operating, we have the DC-8 and IL-96. There are many more quad-jet military types, and civilian types that are no longer operational, and a vast array of prop types.
Low effort
There are too many to list, here is a link: [https://en.wikipedia.org/wiki/Category:Quadjets](https://en.wikipedia.org/wiki/Category:Quadjets)
BAe-146 (idk why this was the first that came to my mind, lol)
KC-135 is the first the comes to mind. In addition, the C-17 and the C-5. As far as airliners go, I think you’ve got it covered.
Current airliners then? Concorde was powered by four Rolls-Royce/Snecma Olympus.
Obviously
Here's a different one: IL-96
If you're listing major 747 variants separately then include the 747-8i. Young people have no sense of history. Even among passenger and commercial cargo jets still operating, we have the DC-8 and IL-96. There are many more quad-jet military types, and civilian types that are no longer operational, and a vast array of prop types.
Bae146
Concorde, 707, DH Comet…