Singapore Airlines & JAL (Japan Air Lines) are my personal top. But in general I tend to like the East Asian airlines, the attendants make u feel like Saddam Hussien, and that's my ingredient for a top quality airline :)

I dunno how IATA grades, Continental airlines has a 5/5 rating, and Garuda Indonesia a 3/5.... and I seriously dunno how they figured that calculation out, so I don't use IATA's rating system...

In general , East Asian airlines are the best in the world.

Emirates, Cathay Pacific, Quantas, Air France, Lufthansa, Continental, East West, Thai, Singapore Airlines, Qatar Airways, Malaysian Airlines, British Airways, Northwest Airlines ....