Chris wrote:
How do aircraft manufactures determine the maximum gross weight for a
given plane? I know I've come across articles that mention on a cool
day you can go over the max. gross weight by a percentage, I think
20% was thrown out there but not sure. Then again, on a hot day you
might not get any where near that. Is it determined by a standard
temp?

Which articles suggest it is OK to fly a plane over gross?