Well, I use DATCOM and since the CRJ's wings are pretty much double delta wings with a break span instead of a straight tapered wing. So, with three-view top down view in hand, I measured the root chord, tip chord and break-span chord. Then with the formula: (b/2)*root chord*(1+taper ratio) These are for both the inboard and outboard panels. Add them up and you should get the total wing area. I get 322.8 for the inboard panels and 279.52 for the outboard panels. Add them up and you get 602.32 whereas the advertised CRJ area is 520.4.