About how many years passed between when the Shoe Bomber tried to bomb American Airlines Flight 63 and when he pleaded guilty?
return the  Shoe Bomber tried to bomb American Airlines Flight 63 ;return the  Shoe Bomber pleaded guilty ;return year of #1 ;return year of #2 ;return difference of #3 and  #4
['select', 'select', 'project', 'project', 'arithmetic']