Originally Posted by
no1cub17
Google flights also has it's limitations though - for example, doesn't find Air China flights. Priceline has been the most reliable for me - if that doesn't work, bookwithmatrix would be the next best option.
The OP isn't looking to book Air China flights or through Priceline. S/he is wanting to book a complex itinerary directly with AA via aa.com, in which case Google Flights is probably the best go-to in this situation.