Unless you can afford to fly first-class or business class, economy or coach-class will be the place you will be when you travel domestically or internationally.
USA Today has an article on the airlines with the best coach-class in the world.
They begin their article with:
You see a lot of "best airline" stories, but many look suspiciously like they were based on business and first class. For most travelers, however, what happens at the front of the plane stays at the front of the plane -- it's something to fantasize about, but prohibitively expensive and not even remotely achievable in this lifetime.
As to real-world flying for real-world travelers, everyone knows that the coach or economy airline product in the back of the plane runs from miserable to unacceptable. The "best" options are really the "least worst." So with that in mind, here are the best coach-class airlines in the world.The airline with the best coach-class to Japan, it is...Japan Airlines.
To see who are the best coach-class airlines in the world, go here.