It appears that I could have done this again on Sunday morning. They were asking for volunteers for the 6:15 a.m. flight! I had a ticket for the 7:10 a.m. They needed two volunteers, got only one, and involuntarily bumped another guy. I chose to take my flight, but all the flights for the rest of the day were oversold apparently. They were putting people on taxis to Ontario for alternate transportation!
The main reason that I did not volunteer is that they were offering free tickets, rather than dollar vouchers. For reasons discussed above, dollars are much better for frequent flyers like us. Another reason is that I would be bumped only once and have to endure a long cab ride to Ontario. No thanks.
Bruce