All of those days look great on United as well. You can only fly business or coach, yes?

Do you have a chinese visa yet? If not, I suggest that you get one ASAP +-many days to give you many options, such as having it valid April 20 to May 19.

I've non-rev'd to PVG several times. It is an ultra modern airport.

When you are coming back: I suggest that you have a print out of your listing if that is possible. I've had the CSRs at the Beijing airport try and snake me out of first class to get one of their lower seniority buddies up front. Have a pen handy. When you get to the airport, you have to fill out an exit paper, and it is usually a big SNAFU at the kiosk where the papers are. You need to hand this in to an official to get to the customs/immigration line.

Have you ever been to China before?