I priced out a trip at $5400 (business class to London with throwaway hotel for 3 nights). The super-special "MEMORIAL" code would save me a whopping $6.02. I priced out the same trip the next day and now the super-special code saves me $1.93. So we can conclude that the super-special bonus code is variable and it saves you (rounding off to the nearest whole percentage point) somewhere between Zero and Zero dollars.