IIRC, the A-10 has a ridiculous loiter time already, one of the many reasons it performs well at CAS, no? Probably not the same loiter time as a turbroprop, no. Wouldn't the OV-10 that was in another thread about possibly being resurected be able to perform something similar as well. It would also seem that the A-10 has the added benefit of triple redundancy of quite a few systems on the aircraft as well as a very large wingspan, two tails and has proven itself able to take a lot of damage and bring it's pilot home. Would all of the above fit on a small aircraft such as that?