From their web site.
Cargo Solutions at Jet Speed
Since the 1980s, we have been helping businesses fly mission-critical freight across North America. We are an FAA certified airline and have received the Platinum rating by ARGUS International for eight straight years. We are also proud to operate more than 36 percent of the available heavy-lift cargo aircraft in the industry. That means we have the capacity to safely transport your time-sensitive freight precisely when you need it most.
I'm not trying to hate but Wiki says they have 12 aircraft in their fleet ranging from Falcons to 727's. Three Widebodies from any of the other ACMI carriers would just about equal their total lift. That statement seems like they pulled that number out of their posterior.