This summer I travelled by plane a lot. At some airports there was Internet available, but at many I couldn't find any free Internet access. Is there something like an overview available that lists as many airports as possible and indicates if there is free Internet available at these airports?
There are at least three sites online that cover this:
When I asked a similar question about Astana airport, my eventual solution was to use Foursquare - if people have checked in there, there's a good chance they had wifi, or may even mention it. I found the relevant page for the airport and voila - lots of mention of the wifi.
Also I nearly marked this as a dupe, but you may want to check out other free wifi links in a similar question on whether there are listed free wifi hospots around the world.