Used this thread to buy HKG-LAX-JFK-DFW-MEX. I noticed that there is first class on the transcon and called EP desk about upgrading to First on those two flights only. The agent couldn't make anything wait list, much less go through. I asked about using 500 mile certificates, she said doesn't apply if EP. Then she mentioned using miles +$75 and said it wouldn't let her even enter it. Anybody know of any language to use to help EP desk get me on the upgrade to First LAX JFK or is it really not even possible? If it's not even possible, anybody have experience on the transcon and getting some sleep?