Several of you mentioned UTA. Being a bit older, I'll put one in for its predecessor, UAT (Union Aeromaritime de Transport), with its DC-6Bs on the JNB/SAY/BZV/NCE/LBG run in the late 1950s. Brazzaville/Nice non-stop in 13 hours, and a small boy fascinated by the cycling of the gills, occasionally revealing the white-hot exhaust manifolds as she thundered through the African night sky.