I'm working on planning my best friends wedding in March. This will be my 9th trip and her 5th to the rock. I am looking for any suggestions on booking flights. How far out do the airlines release flight dates? 120 Days?

Normally I wait it out to see what all unfolds but since we will be traveling with a large group I don't want to lead them in the wrong direction. I think there will about 20 of us or so....

Any suggestions would be great! Thanks!