Ryanair has utilized several key strategies to become Europe's largest low-cost carrier. These include maintaining a laser focus on cost containment, operating frequent point-to-point flights on short-haul routes, and maximizing ancillary revenue sources. Ryanair keeps costs low by operating efficiently from secondary airports and maintaining a young, fuel-efficient fleet. The strategy has proven highly sustainable due to Ryanair's continued growth and profitability, though recommendations include increasing flight frequencies and opening new routes to drive further expansion.