Haha, 12 years later I will provide an update on my previous comments...

Most of the women I knew when we were younger did ultimately have kids, and many of those either dropped out or took a significant career delay for the kids. The top of the FO list at my old regional base is stacked with moms who are taking an 18-year career timeout and just need the schedule control.

One gutted it out in corporate and ULCC, finally got the dream legacy job, had another kid and took lots of FMLA... maybe that's how to do it, but then you have the bio clock issue (she started pretty young). She'll probably have a few more years off now (fortunately hubby flies cargo).