Unfortunately, the penny pinching airlines are not offering many discounts. Some offer 1/2 off if they are UNDER 2, but otherwise you pay full price.
AKAir offers the fly free special to LA area for Disney every spring, but that's about it
I would suggest figuring out which airline you fly the most and start banking your travel with them. You should be able to accrue enough miles to get a free ticket after 3-4 flights depending on where you are going.
We personally bank our miles with AKAir, and also use their visa card which comes with a companion fare every year. That mean we can get our 2nd ticket for about $100 after fees and taxes. We also get miles if we fly on their partner airlines, which are Northwest, Delta, Continental, American, to name the big ones.
We fly a lot too, and I'd be more than happy to help you research which airline to stick with. -j