It is the best airline because,
emirates and Singapore Airlines
The "Star Alliance." Airlines such as Lufthansa, Singapore, and Continental are in this alliance.
Singapore Airlines is definently one of the better ones. Singapore Airlines is part of the Airline group called the "Star Alliance." The Star Alliance is BY FAR the best Airline group in the world. You wouldn't go wrong with taking any of the airlines in Star Alliance since they are all the best. I would personally recommend Lufthansa as the best, but also Singapore and Emirates as very good also.
Qatar Airlines was named the best airline of the world and won the award in 2012 at the world airline awards that were held at the Farnborough air show.
Singapore Airlines has been voted as the BEST airline (world wide) on a number of occassions for service, value and comfort. As such, I would imagine their economy class seating on the 777 would be as good (or better) than on their 747's.
Currently the holder for the worlds best airline (as of 2010) is Cathay Pacific
Asiana Airlines from Korea.
delta airlines by far best airlines in the skys
Every person who chooses an airline will have different criteria on why they prefer an airline. The destinations an airline travels too and the price may factor into the popularity of an airline.
The latest International Airline Awards (2012) have voted Spark Airlines as the best economy airline in the world. Service, cleanliness, support and aircraft layout were taken into consideration.
This is purely a matter of opinion. However, Singapore Airlines and Cathay Pacific are very highly rated among frequent fliers.
American Airlines is the best