My favourite airline with the best service I have seen so far is Virgin Atlantic. By miles!. Their service is excellent, seats wider than usual, decent hand luggage space over the seats, fantastic service, etc. And if you are lucky to fly in Business or Club class, well, it is paradise!. But their economy cabin is great too. I just wish they flew to Argentina as well.

Bristish Airways must be one of the best ones too. And, I was very impressed with Air Canada when I went to Toronto in February.

The worst one, in my opinion, is Alitalia.

I have flown with many others too like American Airlines, Varig, etc. and they were just ok.