Originally Posted by
seanherron
You can go to jetblue.com and try to purchase the flight. During the process it will show you a seat map and ask you to choose a seat. That will show you how full the plane is.
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.