My father is on a Visitor Visa (B2) and his 6 months of I94 expires on Sept 27th 2012. We have relatives in UK that have requested my father to visit them. He does have UK visa until Sept 23rd 2012. If he travels to UK and stays there for 15 days and comes back to US then can he get a new extension for another six months? This way could we avoid filing for I539 (Extension of Visitor Visa)? Any help in this matter is much appreciated.