5 Most Popular Airlines in the World

4. Ryanair Holdings plc (NASDAQ:RYAAY)

Annual Passenger Traffic: 97.1 million

The headquarters of Ryan Air is in Dublin, Ireland. The airline has a fleet of about 542 aircraft and flies to many destinations in Europe and North Africa. It’s one of the biggest in Europe and is well known for its inexpensive rates and no-frills style, which lets customers personalize their journeys with add-ons.