Modern-day airports mix transportation nodes with hospitality centers, focus on customer experience and offer fine dining outlets, luxury shopping outlets and full-service spas.
That said, which airports do it best? Each year, Airports Council International — the trade association of the world's airports — conducts extensive passenger surveys to find out.
For its 2015 Airport Service Quality Award rankings, ACI surveyed more than 550,000 travelers worldwide about their traveling experiences. They ranked airports on everything from check-in and security to on-site amenities and food, beverage and retail options.
"Airports have evolved into complex, customer-focused businesses in their own right that in many cases are in competition with each other for passenger traffic," said Angela Gittens, director general at ACI World.
"From duty-free and restaurants to ambiance, cleanliness, courtesy of staff, amenities, efficiency and more, air travelers are expecting big things from the airports through which they travel," she added.