[andrewla]

Can you give some examples? I'm curious as I also find the de Havilland Comet design to be quite remarkable for this compared to modern jetliners, and this is the first time I'm encountering the design.

EDIT: I found this wikipedia page [1] and clicked around, and the only jetliners I found without nacelles are the Tupolev ones -- the Tu-334, Tu-104, Tu-110, Tu-124 -- and the Tuplev supersonic Tu-144.

[1] https://en.wikipedia.org/wiki/List_of_jet_airliners

[mannykannot]

The Avro Canada Jetliner is another example, though it never went into production, and if you are including the Tu-144 then the Concorde belongs as well, and the original 737 also had its engines mounted directly under the wing, without pylons. While it is not quite the same, I think all trijets except the DC10/MD80 had the third engine buried in the tail.

There were many military designs, such as the British V-bombers, with engines mounted in or directly on the wing, without pylons.

[mcguire]

Interesting point: the 737 was originally designed to take off from gravel runways.

[rsynnott]

Hrm, I thought the Sud Aviation Caravelle also lacked them, but I was wrong (though they're in an unusual place on it).