Many of California's new electric-car owners say they, too, are counting on the free airport parking trumpeted as a perk on electric vehicle makers' websites to continue at least a few more years.

WSJ: It's Less Easy Being 'Green' as Los Angeles Yanks Plug on Free Parking for Electric Cars

The airport offers free city tours to all travelers on a stopover of five hours or more and plays host to facilities such as an on-site swimming pool, butterfly garden, nature trail and cinemas.

CNN: And the world's best airport is ...

Changi was also one of the first airports to introduce free WiFi areas and previously scooped the Skytrax best airport award in 2000 before going on to win again in 2006 and 2010.

CNN: And the world's best airport is ...