The B767-300 for long-haul is not what I would call a "small aicraft".
There is quite a few examples of real "small aircraft" for long-haul :
in the mid 90's Air Liberté used the MD83 for charter flights : ORY
-CMB with intermediate refueling stop at ISTand DXB
, one single cramped Y class, NO IFE of any kind...
Star Airlines using an A320 on CDG
Air France using a A319LR on CDG
-DOH or CDG
LuftHansa (Privat'air) using A319LR or B737NG on DUS
using an A320 on LHR
French President J.CHIRAC using a "République Française" A319CJ for a visit in Japan
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Photo © Takeaki Sunada