The aerial and water scenes were filmed in the Whitsundays - up around Grimston Point (about 5nm north west of Airlie Beach).
The flying 206 was one of Akuna's - they got a paint job out of it. I can't remember the rego - the VH stickers were removed for the filming.
Quite interesting watching the stunt man on the float for the take off from YSHR - I thought they'd left a bag on the float. Also interesting was watching the art department making the Wip floats look like the PK's of the wreck. Surprisingly the aircraft had a very matt finish - apparently looks better on film.