I once volunteered and got $800 and was rebooked on another flight 6 hours later. This situation, sounds like they had to stay overnight in Chicago. I agree, stop being cheap. I got $800 and got a free room at the hotel next to the airport since my flight was at 10 at night and the next was 7 am. Used the $800 on another flight that I wouldn't have planned if I didn't volunteered so it worked out. Still, it's a volunteer program. You can't just forced someone to leave without a good reason. All of this so United employees can get on the plane (they can't get on other planes, wait for the next, find another way, call Louisville saying that you can't make it so they'll have to call another employee to come in, etc...???).