The airline with the best average rating is Air Canada with 7.4/10.
The average flight time is 7 hours and 41 minutes.More information
I prefer flying with B777 than A340-600 or even A340-300. You feel that those planes are old and not so comfortable at this time when we can expect high standard comfort on board.
Cabine crew were rude, quite tired but it's not OUR problem, as they have time to rest between 2 long-haul flights.
Thanks, LH made effort during last 4 years.