Flight tracking website
Shug is off on a business trip, and so I went looking for flight tracking websites. Found one which is very useful:
FlightStats shows trouble spots, and if you enter a flight, shows its location, with a radar map option so you can see weather problems.
Lots of other info as well.
However, to find if the airplane you're counting on for your next flight is late, go to flightaware.com, enter the flight number, and then click on Track Inbound Flight (circled in red below).