What day of the week are cheap airfare rates released?

I missed the $44 airfare deal through Southwest. Does anyone know how often they run specials? Someone told me Tuesdays, not sure if that is true! ThanksWhat day of the week are cheap airfare rates released?
You need to check every day, they are released whenever the flight becomes available.

For instance, if your buying tickets 3 months from now, the cheap tickets are released.

Basically, the second a flight is added to the schedule, all the rates are there. The closer you get to the day of departure, the higher the rates get.
It can happen at any given time or day. It's as they have the lower seats available so call them directly or keep looking at their website. One tip is to look at the website after midnight. If someone puts a seat on hold, the hold normally expires at midnight and then availability will go back into their system.What day of the week are cheap airfare rates released?
I don't really know either, but I've heard they have some really good deals!