One of the product features that makes group airfare unique is the ability to change names on a ticket.
When you purchase a single ticket on Expedia or the airline website, you cannot change names on the ticket.
Let’s say you buy tickets for you and your best friend to fly somewhere. If your best friend gets sick, you can’t swap the name on the ticket for your Mom to replace your sick friend.
However, with group contracts you can change names on the ticket up until 72 hours prior to departure with most airlines.