These are the world's best airports for 2019

London (CNN) — What makes an airport a "world's best"? High-tech facilities? Friendly staff? Great leisure amenities? Speedy immigration service?

According to Skytrax World Airport Awards, being a global travel leader means constantly striving to improve, innovate and impress.

And so for 2019 -- and for the seventh time in a row -- Singapore Changi Airport has crowned the world's best aviation hub, just in time for the opening of the much awaited Jewel Changi terminal, in April.

"To be voted the World's Best Airport for the seventh consecutive year is a truly fabulous achievement for Changi Airport, and this award continues to underline the airport's popularity with international air travelers," Edward Plaisted, CEO of Skytrax said.

The prestigious accolade was awarded at the Passenger Terminal Expo 2019 in London on Wednesday.

The Skytrax World Airport Awards are voted for by customers in a global airport customer satisfaction survey.

As well as counting down the 10 best airports, Skytrax awards gongs for categories including regional airports, best airport staff, airport dining, baggage delivery and cleanest airport.

Best of the best

Singapore Changi Airport is known for its rooftop swimming pool, two 24-hour movie theaters and shopping spots.

When Jewel Changi Airport opens, the transport hub will also be home to the world's tallest indoor waterfall.

At number two on the list is Tokyo International Airport (Haneda), up one place from 2018. This hub also won World's Best Domestic Airport and World's Cleanest Airport.

Breaching the top three is Incheon International Airport, down one place from its second-place spot in 2018. Incheon remains a stalwart of the airport rankings, also nabbing an award for World's Best Transit Airport.

New to the 2019 round-up is Narita International Airport, at number 9 -- known for its quirky running track in Terminal 3. Narita is one of three Japanese airports in the top 10 -- Central Japan International Airport is the third, at number 6.

Heathrow Airport is number 8 on Skytrax's list.