Is there a weight/balance issue on CRJ900? (I assume the blanket answer is that there is a W/B issue on any aircraft), but more specifically, I just scored an upgrade Wednesday PHX-SAT. I was given 1F, 1A is the only other seat take in F. As I am SP, I assume any upgrades have cleared by now. First, it seems very unusual for F to be so empty, but I switched my seat to 2A to get the single side. Looking at the seat map now with only 1A and 2A taken in F, it made me think there may be a weigh issue....any thoughts?