Seattle - Irish airline operator Ryanair has taken over its 500th Boeing 737-800 at Boeing Field in Seattle. The airline is the biggest operator of this version of the 737.

The Irish low-cost operates an all Boeing 737-800 fleet except for a Boeing 737-700 (EI-SEV) and three corporate Learjet aircraft. Ryanair also purchased a used Boeing 737-600 for stationary mechanic maintenance and cabin training in Stansted.

The planes, deployed at their bases in different countries of Europe, swarm to their destinations during the day and return to their bases at night in a simple pendulum system.

Routine maintenance tasks are conducted during the night shifts without disrupting daytime operations. Before major maintenance events, Ryanair sells its aircraft while they are still young. Thus, the airline achieves a very high operational readiness with a very young fleet. Due to very large order amounts, the company receives volume discounts when buying new.

In 2014, Ryanair also ordered a bespoke version of the Boeing 737 MAX 8 for 100 aircraft. The company added ten more of the same type to this order on June 20, 2017. The 737 MAX 200 will carry 200 passengers, eleven more than today's 737-800s.