... you're waiting for the bus and you see a Boeing 767 flying overhead and notice that it's a Hawaiian Airlines airplane. But wait, this is not its normal approach, this is the GLASR flight path to KSEA (usually westbound, eastern seaboard, upper midwest flights)
So you pull out your iPhone, hit FlightAware, look up arrivals for KSEA and see that, sure enough, its a Hawaiian charter flight from KATL. (Btw, I still use FlightAware from Mobile Safari, as their iPhone app leaves a lot to be desired).
