If you click on any city pair, you get the url look like this :

https://www.aa.com/reservation/lowes...etSAAVER=true&originAirportCode=LGA&destinationAirportCode=DUS&advertisedPrice=971

look for originAirportCode=XXX and destinationAirportCode=XXX and change it !

It works ! (as of today )

complete url