said by claudeo :

...but most airport make it impossible to get power for your laptop. I have scouted out outlets in a lot of airports and sometimes there is a waiting line of people to use them. I usually carry a little 3-way cube so I can share when I find one (whether or not it is in use already )
The most amazing thing is that you find this appalling lack of planning even in brand new terminals. For example, the A wing at Seattle-Tacoma has one double outlet near some of the gates, rigged so that people have to trip over your cord if you use it. I found a grand total of 3 accessible outlets in Terminal 4 at Heathrow, presumably one of the busiest international transit hubs in the world! In many terminals, there are simply no outlets at all. Some others have outlets that are hazardous to use (burned spring contacts, loose attachment). I understand the technical/security issues, but in the US they could very simply use low amp rated GFCI outlets ($9 at Home Depot) to limit power drain, prevent accident and especially prevent anyone from accidentally tripping the breakers for circuits that might feed other stuff. But airport builders are still living in the 20th century it seems.