Aamir Khan was spotted at the Chhatrapati Shivaji Airport in Mumbai on August 6th just after 1 o’clock in the morning with his son Azad Rao Khan strapped to his chest departing on a flight to Chicago where he will be staying for 3 months to shoot the much awaited action flick, Dhoom 3. The second sequel to Dhoom (2004) comes after the success and buzz that Dhoom 2 (2006) received from the general audience. In the past, John Abraham and Hrithik Roshan have played the antagonist in these films and this time, Aamir takes on the responsibility for this role. Katrina Kaif will be co-starring as the pretty lady (we kid, of course). From what we hear, there will be some action between Aamir Khan and Katrina Kaif. We mean some dhoom shoom, not THAT kinda action! As per tradition, both the leading stars have gone through extreme fitness regimes to tone up for their roles.