Can anyone tell me what the group column represents when looking at the seats available list on the flyingtogether site? Thanks in advance.

Hemaybedid

The first column. As is SA for seats available

F/C/Y = First/Business/Economy

Like free flyer said, you mostly care about the first column (Avail), which equals Capacity, minus Booked, minus Held. The SA column shows the number of passriders, click on the pass rider list to see how many of those SA's are above you on the list.

Example:
777 from aaa to bbb

Capacity is 8/40/221 (8 First, 40 Business, 221 Economy)
Booked is 4/33/180
Held is 2/0/0
Available: 2/7/41
SA: 6/0/2

Based on this, you have 6 SA's listed for only 2 available First class seats, but there are 7 seats in business and tons of 41 seats open, so its likely that All SA's who wanted First will get First or Business, unless enough economy passengers buy an upgrade