Immidiate help!

Hey I need all you airline buffs to help me out, I need a site that I can track a flight real time. If you could give me a link that would be great! The situation is my dad is in MSY flying home to CVG tonight on DAL1662, which was supposed to leave MSY at like 6:30 or somthing, but the airplane which is a 737-200 is stuck in CVG for weather or whatever.......the flight down is 399, im just trying to find out everything I know and relay the info to him, all the help on this matter would be appriciated very much. Thanks to all!