We can plan to burn extra fuel BUT legally it can not be documented as Vilas said. Common sense or not, a flight can not depart with a flight plan that says OW landing at destination. Boeing fctm has a different section on OW ldg and it will do fine but that does not mean we can plan overweight landing or plan to burn excess fuel BEFORE departure deliberately in order to achieve ldg wt limitation at destination. If you plan to burn more than normal burn off by choosing different altitude or speed/mach etc then the additional burn off gets to add in the total burn off in the flight plan so I dont know how its possible to document the additional burn off for legal purpose