question: What are the number of international and domestic passengers of the airport named London "Heathrow"?
#1 return airports 
#2 return #1 named London Heathrow 
#3 return international passengers of #2 
#4 return number of  #3 
#5 return domestic passengers of #2 
#6 return number of  #5 
#7 return #4 ,  #6