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