[SadieAnn]

Sorry, no info on plane fares but a comment on not restraining a child on a plane.

The first flew with my son when he was @ 4 mos old, I opted to hold him.

I carried him on the plane in a body carrier and sat down. It was at least 15 min to take off but immediately the flight attendent came up and said, "you know you can't keep him in that when we take off, you have to hold him in your lap AND you cannot put your seat belt around him". (Imagine someone with a very bossy attitude).

So I would say, apart from purchasing a 2nd seat, at least on domestic flights they do not allow you to secure your child anyway except for the tighest grip possible from your arms. (Which is what I did!)