According to NewsWireless.net, Guinness World Records has recognized the world WiFi distance record, established at 310 km by WiFi equipment maker Alvarion and the Swedish Space Corporation. Of course their settings are not exactly your customary AirPort ones, and you would not exactly want to have a 6-watt transmitter sitting in the laptop on your knees (I wouldn't).
Meanwhile, and not just because complaining is supposedly a French national sport, I am still bitching towards railways and airlines companies for not providing Internet access onboard. A fast train round-trip in business class costs around 160€ for Paris-Brussels and 590€ for Paris-London. It would be just about time to think on useful ways to justify those costs (especially those of the Eurostar which are close to robbery). My "customer experience" would be better improved by a decent net access rather than throwing more cheap alcohol and junk food at me (no, I don't want to eat at 5 or even 6pm). Even an Ethernet plug would do!