FS2004 ATC Update Heston JC.6. ATC modifications for the Heston JC6. The Heston JC.6 was a British prototype air observation post (AOP) aircraft designed and built by the Heston Aircraft Company Limited, who had previously designed and built the following models, the Phoenix, the T. 1/37 and the Napier-Heston Racer. The JC. 6 was also known as the Heston A. 2/45 or the Heston AOP. To be imported using EditVoicePack. By Mike Stallwood.