Oris Big Crown ProPilot Altimeter - Yoson An - Plane
The Oris watch worn by Yoson An in the film has an olive green nylon strap, black dial and large, 47mm stainless steel case, with Feet scale (as opposed to Meters scale), reference nr. 01 733 7705 4134-SET 5 23 14FC or the very similar 01 733 7705 4134-SET 5 23 17FC (which has a grey strap in stead of green).
The special feature of this watch is that it has a mechanical altimeter.
Retail price: $3,800 and you can also find new and used models on eBay.
In the same film, protagonist (Gerard Butler) wears a Jaeger-LeCoultre Polaris Chronograph WT watch.