I will have to start doing AMS - IAH monthly. Fortunately, the client is flexible on the days I can fly out. My first flight is next Wednesday, May 09th. I assume middle of the week is better, but normally I'm taking the FRA - SFO and know that route like the back of my hand. My question is, what are people's experiences with AMS - IAH, i.e. for upgrade chances on specific days?