Let me say, again, that Ryanair's service is great for families. We bought our 5 tickets for our trip to Germany (Frankfurt Hahn) for less than €150 (about $200). That simply can't be beaten. Anytime I've tried to find internal US flights for all five of us I've never seen prices anywhere near as low.
With Ryanair my children get a taste of other countries/cultures and I get to brag that my carbon footprint just got a bit bigger. Who can argue with that?