Task: Question Generation
Input (English): #1 return airports 
#2 return aircraft #1 are associated with  
#3 return #1 where #2 is  Robinson R-22 
#4 return passengers of #3 
#5 return number of  #4 
#6 return sum of #5 for each #3 
#7 return average of #6
Output (English): What is the average total number of passengers of airports that are associated with aircraft "Robinson R-22"?