e500 and flight standby
I am going to fly from DAY to LAX via ORD on 8/29. I will arrive in ORD around 7pm, but the next flight I got was the 10pm-ish flight to LAX (it was cheaper than some earlier flights). I was thinking of using my e500 for the 10pm-ish flight, however, if I decide to standby for the 8pm flight, can I still use my e500? How can I use it?