Ever since the site changes to ITN and thus also FLYAOW, I am unable to get either site to display one carriers availability. Even if I select an airline in the drop down, and the return URL looks like one carrier is designated, the search now just seems to return flights with all carriers with a seeming preference for nonstops. An example return URL I got for a BOS to LAX search is:
https://www.itn.net/cgi/air?stamp=*i....1=Jul&date.1= 26&hour_ampm.1=6+pm&airline=US+Airways&air_sort=de parture+time&air_class=coach+%28lowest+avail.%29&a ir_avail=20&air_sort=price+%28lowest+to+highest%29 &skill=an+expert&return_to=jet %2Fair_avail
In the past, if I selected one airline, the search would display that carriers availability.