Basic Premise SPOILERS
Would the weight of four extra passengers really hinder the ability of the plane to clear the trees on take-off?
I don't know what kind of plane it was. Looked similar to a DC-3. Specs on that:
Weight:
Empty: 16,865 lbs
Maximum Takeoff: 25,200 lbs
They emptied the plane of every thing they possibly could leaving a barren fuselage.
The four remaining passengers weighed I'm thinking a maximum of 700 lbs. Seems negligible under the circumstances and as such a total dramatic contrivance requiring a little too much suspension of disbelief for my taste.
Liked the movie anyway.