Air Transport World magazine is probably the best source to get the information. This ATW magazine is one of my airline subscription and this one is only one that keep up on information of every airlines from regional carriers to major carriers on every data around the world.
Once a year ATW usually list all major and regional carriers fleets. Every issues, they would give ranks of all major and regional based on rev, rpm, passengers, etcs.
Aviation Weeks & Space Technology magazine also provide the whole information once a year, too.
Hope that help?