Technically, this is really hard to do, because there are still some old, old workhorses still in "service" (like the 737-200, 727s, 707s, etc).
But of the "Modern" aircraft still in service, I've never been on:
Boeing 777 (any variant)
DeHavilland Dash 8 (any variant)
Embraer 135/145 (any variant)
Embraer EMB-175/190 (any variant)
CRJ-200 (any variant)
I'm sure there's more.
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