Delta Connection Academy does not hold an approval to provide JAA training, joint or otherwise (there is no such thing as a joint approval). Atlantic Flight Training holds an approval to provide JAA training at Sanford using Delta's facilities.
This may seem like splitting hairs but it is an important distinction. Should AFT decide to pull the plug or run into any other difficulties which result in them losing their approval, Delta cannot continue to train for JAA licences and ratings on its own and would bear no financial responsibility to its JAA customers.
There is no suggestion that AFT is in any kind of difficulty, or is likely to be in the foreseeable future but if you are spending large amonts of money it is as well to know who you are really dealing with.