The world's largest airline is United, followed by American, Delta, Northwest, Continental, and British Airways.
In terms of passengers carried, Delta is the biggest. American has a bigger
fleet than United (over 700 planes, vs. close to 600 for UA). British Airways
carries more International pax than anyone else, except for possibly DL.
The US carriers rank as follows:
Trans World Airlines
The "new" Air Canada is the tenth largest airline in the world. ANA is Asia's largest airline. Lufthansa is Europe's second biggest, followed by Air France,
then Alitalia. Varig is Latin America's largest airline. SAA is Africa's biggest