A conveyor system for transporting menu boxes (14) in an aircraft is equipped with at least one heater element (17) or groups of such elements (17/17A . . . ) which tilt automatically into spaces (16) between neighboring boxes (14) or pairs of boxes within the conveyor which is stopped during heating. When the heating is completed the elements (17) are again tilted into a rest position (17') outside the conveyor. Induction heating is preferably used.