Talking about boeing 7' series (737, 767, 747).
I looked at their AOM's and it seem that there is no data on fuel burn in climb (only N1 in climb). All there is - for long range cruise control perfomance (
http://img359.imageshack.us/img359/7...fomancevl0.jpg). So how climb burn is calculated, especially with taking gross weight into account?