Here's an idea that I'm surprised no one at all has suggested yet: a two tiered system. One for business travelers who are always on their own, and one for families where you can earn points on adjascent seats (ie mommy daddy and baby's points all going to the same account). Of course the redemption rates would be higher for the family one, but you could make them more geared towards families (ie 200000 points flies two adults and one child to Orlando from anywhere in the US, 50000 for each additional child)
For the business one, they could have stuff like 3000 points gets you free broadband on the flight, etc.

Edit: Holy Crap! They're flying to YOW (or so they say) I've never heard of this airline before but I hope they're really cheap. Are they?

[This message has been edited by canrocks (edited Mar 16, 2004).]