Based on publicly available data, compare the four mega-carriers across the following characteristics: a. Number of aircraft by type; b. Number of employees; c. Departures; d. Revenue passengers; e....

Based on publicly available data, compare the four mega-carriers across the following characteristics:
a. Number of aircraft by type; b. Number of employees; c. Departures; d. Revenue passengers;
e. Revenue passenger miles; f. Available seat miles; g. Operating revenue (total); h. Operating revenue per seat mile; i. Operating profit.