This is an interesting concept...using Boeing 727 and 737 fuselages stacked in a north-south slant in relation to sun exposure for energy efficiency. Apparently, the fuselage is the only part of a decommissioned airplane that can be used in the recycling process. The money made reselling the aluminum from the fuselage is less than the cost to break it down and get it ready for sale...thus a huge number of fuselages wind up in the deserts of the western US unused. Boeing 727 and 737 are historically the most sold commercial planes and therefore the most common in these graveyards. They are sold at very low prices completely stripped and in great structural conditions.