A bit of googling suggests kAirPort a daemon or utility of some sort that has to do with the system's enumeration of WiFi hotspots. From what little I've found, it seems like a "whoops, something's abnormal, reboot before other things start to misbehave" situation.
So, reboot your computer, and expect to not see it again.
Might be a good idea to reboot your router too. Can't hurt... I find my Airport Extreme benefits from (and sometimes requires) rebooting every month or six weeks.