question: from las vegas to new york a nonstop twa and fare 
#1 return flights 
#2 return #1 that  are nonstop 
#3 return #2 that  are twa 
#4 return #3 from  las vegas 
#5 return #4 to new york 
#6 return fares of #5 
#7 return #5 , #6