When I was in Boston Logan I used the airport Wifi to watch realtime flight data on a map, as flights arrived and departed from the airport. Now this nifty bit of software plugs into Google Earth, so you an watch flight data updated every 60 seconds. It works from a number of US airports.
My mum tracked my flight from logan over the summer and was able to tell me it was delayed, i was able to tell her i delayed it.
:-)
test