I retired from a long career with airlines - 1969 through 2008...
PanAm until 1991 - 707/727/747 - Then contract pilot (747) worldwide.
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My favorite contract has been flying cargo with Cargolux 1992 for 6 months.
Superb operation. Was on their older 747-271C airplanes. Based LUX.
All pilots I knew flying such type operations (747F) were by far quite happy.
Examples - JAL Cargo, NCA, KAL, SIA, CX, LH Cargo...
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Happy contrails