what about this:
santa is constantly travelling a few times the speed of light while travelling over the earth throughout the whole year. Time is slower for him because...(ya know), this is why he is so old and has lived this long. He drops his presents while in orbit and does the equations to figure where exactly in space he will have to drop the presents in order to get it into each chimney on christmas night (as it re-enters the atmosphere and drops to the earth). The presents could then freely drop into each chimney by themselves. Since there is no air in space, there will be no air resistance for him and hence no bursting into flames.
Now what about the houses with no chimneys?