I know this has been a topic of conversation here before but just wanted to get some insight before we leave for Paris this week. What is the chance or alternately, how can I improve my chance of getting upgraded on NW if first is wide open? i.e., more than 50% open. Should I ask at the gate or check with flight attendants? Really would love to try to get one of those extendable/lie-flat/reclining or whatever they call them seats.