Originally Posted by
qasr
Call UA and ask to change your ticket to MIA-ORD-LGA on the flights you want. It might be as little as $100 if you have a restricted ticket...
Thanks again qasr! I have just found out from my e-ticket receipt that I'm in L class, I thought it was H, so the situation is even worse for standing by on any other flights or even the next day. I think I will have to call UA and take your advice.