Digging around I found ou that the Paraguayan Air force operated some 1930's Cubs until relatively recently in the training role but these have been replaced by something a little more modern. Not a surprise as I think the Paraguayan Navy operate the oldest warship (excluding vessels such as USN "Constitution") the "Capitan Cabral" - she was built by Werf-Conrad in Haarlem and commissioned in 1908, refitted in 1984 and was "still in excellent condition" in the last copy of Jane's I have