Flying internationally can be a literal pain in the a** and it is
something that I have to do quite often; so I have decided to make a
list of the top 10 airlines to fly if you are flying economy. This list
does not apply to US domestic air travel. The selections for this list
are based upon seat quality, quality of extras (for example, personal
TV), and service quality (staff and food). The heaviest bias in deciding
positions is towards comfort, with service as a secondary. The data
used in this chart is from
SeatGuru. I have used only the top rating jets of each airline.
10. American Airlines

When I started compiling this list, I was not expecting American
Airlines to do very well, but I was surprised to find it had excellent
extras, such as standard DC power at many seats. If they had power at
all seats they would have scored higher. They also have personal
televisions on every jet. The service was a little low, but it was
bearable and their large seats make up for a drop in quality there.
9. British Airways

Both British Airways and Qantas scored low for having the smallest
seats in the list. My own experience of both of these airlines, is that
while service is generally good, and food is very good (on Qantas), the
seats are very uncomfortable. I was also disappointed to note that BA
does not have power at any seats.
8. Malaysia

The Malaysia air service is very good, and their seats are in the top
on the list for size. While they lack electricity at the seats, they
have personal televisions for all economy travelers. Friendly staff also
helps their ranking here.
7. Qantas Airways

Aside from the unfortunate seats, Qantas has a good reputation and
very friendly service. The food is good and everyone has their own
television. Unfortunately there is also no power at the seats on this
airline.
6. Virgin Atlantic

My experience of Virgin Atlantic was extremely good. The British
staff were much more pleasant and friendly than the BA staff and you
could tell that they have a real eye for detail in the interior and
extras. Unfortunately there were some major breakdowns of the
televisions when I was on my last Virgin flight and nothing was able to
be done for the duration. The seats could definitely be bigger, but all
in all the service on Virgin is great. Free alcohol all the way.
5. Air France

This is another surprise airline. Almost every review I found on this
airline was very good or excellent – the exceptions were generally
relating to delays which are not always under the control of the airline
itself. The seat sizes here also rank in the top, and the food (being
French) is excellent and on long haul flights a buffet is available at
all hours.
4. Cathay

Cathay Pacific have big seats, very friendly staff, personal TVs for
all, and power at all seats. Cathay is now using a special type of
reclining chair based on an office chair design, that allows you to
recline without intruding on the passengers behind you – which means you
will not be intruded on either.
3. Singapore Airlines

This airline has always been at the front of new developments in air
travel. While providing the most common features of the other airlines
here, they now provide live television and access to OpenOffice software
with USB access.
2. Air New Zealand

The only thing stopping Air New Zealand from being number one on this
list is the fact that not all of their jets have personal televisions;
aside from that, the service is top, and the food is excellent.
1. Emirates

Big seats, great service, and personal TVs for all. With Emirates you
get AC power at the seats and access to StarOffice software and USB.
Emirates also has a mini bar at the rear of economy which is available
with snacks and drinks for the duration of the flight. You can also
email and SMS from your seat. This airline deserves its rank as number
1.
Source here