A way to avoid the hassle is to call CO anytime before the scheduled departure of the original flight, tell them you are stuck in traffic and are running late, cancel the reservation on the flight, and ask to be put on standby for the next flight. That will assure the rest of the itinerary does not get cancelled.
(BTW, (Sheryl: (EXCELLENT correctly nested parentheses!)))
[This message has been edited by RichG (edited 10-12-1999).]