Originally Posted by
sbm12
No it won't. Seat maps are notoriously unreliable indicators of the number of available seats on a plane. There are frequently passengers with paid tickets and no seat assignments.
The GDS tools that all carriers use to indicate seats for sale are single-digit tools. So they max out at 9 (4 in some cases). You won't know how many more than 9 there are from those systems. And carriers are loathe to give out that data as they generally consider it secret/proprietary/whatever.
Like caphis said, JetBlue seatmaps are generally more accurate than other carriers. Additionally, the method I suggested is really the only way the OP has of checking open seats short of calling the carrier (which he already did). If you have a more accurate way, you're welcome to share it.