also try checking your companies interline travel information, if they have a log in to flyzed.com, it gives you red/yellow/green smiley faces for all airlines, that way you can see if a flight is good

Also you can get a 5 day trial to Flight Availability | Upgrades | Frequent Flyer Information or something like that use google, and they show you how many seats in each fare code they can sell, ie CAL 999 EWR-BOS F9 Y9 G8 K5 U3 ETC

Downside is J6 only shows up to like 4 or 5