What construction standards are used to increase impact survivability of passengers in case of a crash landing?
In the US, the FAA has no requirement for crash integrity or safety of the air-frame (and they have been heavily criticized for this). There is no requirement for crash analysis like is done for automobiles. The only requirement is the seat integrity. From 1988 to 2009 the FAA has phased in the requirement for the seat and restraint system to remain secure - from 9G to 16G. New York Times

This is similar to the question,
"Why are passengers not given the option of shoulder harnesses?"


[Safety Report]