wow, Cheri, that could get very expensive. No way you can just tranquilize and fly them commerical with you? Maybe I am misunderstanding what you are needing, and you really aren't looking for a private charter. But.......
You could see if Air Athens still operates out of Addison airport. If they cannot help you, maybe they could point you in the right direction. Or call any of the private charter companies in the phone book. I would think out of 3 airports there, although DFW is so commercial, you could reach somebody that could give you some answers.
If you really want to check into chartering a private flight, you could email this site and ask for recommendations on how to achieve the results you are looking for, but finding a private charter there locally would have to be a little less expensive. http://www.aircharternetwork.com
I have a buddy who pilots for Continental and asked him for suggestions, but not knowing his flight schedule, I have no idea when he might answer. Plus, he is houston based - not dallas.