I like Air France and South African as well. My nephew (state dept guy who travels all the time) tells me Singapore is his very favorite.
Europe also some some no fills carriers that are amazingly cheap. I like those. The worst carriers i’ve flown recently have been US carriers. The prices aren’t great, the service is poor (I recently flew from LA to NC without a meal!), and you get killed with fees. The whole procedure of using a US airport is also a pain now. I’ve been living in New Zealand and just last week I took a domestic flight where I was checked in, had dropped my bag, and was through security in under five minutes.
Years ago, we took Singapore Air from L.A. to Tokyo, on to Singapore, and then down to Perth.....fabulous doesn’t begin to describe their Business Class.