Does anyone know the best way to select seats on China Eastern? We're traveling from SFO to PVG using skymiles from 2 separate accounts and I want to make sure we can sit together but DL was not able to help us by either selecting the seats or giving us a China Eastern locator/PNR or ticket number. I called but I was on hold for about an hour and then the line cut off. Any suggestions? Flight is in about a month in Business Class.