AirlineRatings.com has named top-10 airlines for each of the 4 service classes. They do not rank them, but present them in alphabetical order. Generally, Asian carriers dominate the top-10s.
Japan Airlines, Qantas and Singapore Airlines are the only airlines included in the top-10 of each of the 4 classes, while All Nippon Airways, Cathay Pacific, Etihad Airways, and Air New Zealand rank in 3 top-10s.
Air France, EVA Air, Korean Air, Qatar Airways, Thai Airways, and Virgin Atlantic/Australia are included in the top-10 of 2 classes, while British Airways, Emirates, Lufthansa, and Swiss International Airlines rank in 1 of the top-10s. Given the low quality of US carriers it is no surprise that none has been included in any top-10.
For the long-haul economy class top-10 AirlineRatings.com selected the carriers offering at least a pitch (distance between 2 rows) of 31-34 inch (78.7-86.4 cm) and a 6 inch (15.2 cm) recline, multiple complimentary meals and beverages, in-flight entertainment through seat back screens, blankets and pillows. In alphabetical order they are: Air New Zealand, Cathay Pacific, Etihad Airways, EVA Air, Japan Airlines, Korean Air, Qantas, Qatar Airways, Singapore Airlines, and Thai Airways.
For the premium economy top-10 they selected the airlines that offer at least a pitch of 36-38 inch (91.4-96.5 cm) and a 10-12 inch (25.4-30.5 cm) recline, slightly more seat width, in-seat power, a superior meal and beverage service, a business class blanket, and an amenity kit. The selected carriers include: Air France, Air New Zealand, All Nippon Airways, British Airways, Cathay Pacific, EVA Air, Japan, Airlines, Qantas, Singapore Airlines, and Virgin Atlantic/Australia.
For the business class top-10 they selected the carriers offering seats that transform into flat beds, with in-seat power, at least a pitch of 65-80 inch or 142-203 cm, an exquisite multi-course food and beverage service, in-flight entertainment with noise cancelling headphones, amenity kits, duvets, and full-sized pillows. They also offer a turn down service and make your bed up. The carriers are: Air France, Air New Zealand, All Nippon Airways, Cathay Pacific, Etihad Airways, Japan Airlines, Qatar Airways, Qantas, Singapore Airlines, and Virgin Australia/Atlantic.
First class is essentially the same as business class, but with more space, privacy, meal courses, and a wider selection of drinks. Emirates' first class is pictured. The selected carriers include: All Nippon Airways, Emirates, Etihad Airways, Japan Airlines, Korean Air, Lufthansa, Qantas, Singapore Airlines, Swiss International Airlines, and Thai Airways.