My guess is that it's a combination of both. I do think that men and women are biologically wired differently, and that most women are typically wired to desire more active roles in caring for children than most men. There is also a societal norm where men are providers and women are caregivers. Not saying that men don't equally desire children or love them, we just approach the issue differently.

I've asked numerous female pilots that I have flown with why so few women want to be pilots. Not one of them have listed any type of systemic prejudice or discrimination preventing them, it's just that most don't want to. I also asked why so many women are flight attendants and not pilots considering that we basically work the same schedule. The boiled down explanation that I have been given is that becoming a flight attendant takes very little effort. You can take practically any random person off the street and run them through the training. Becoming a pilot takes years of hard work and dedication. The bottom half of the flight attendant seniority list churns because people get hired, find out that a job that requires significant time on the road isn't for them, and they quit. For pilots, many women start out thinking that it sounds like a good job but quit before reaching the end goal because the amount of effort required for a job that requires extensive time away from the family is no longer appealing. The desire to be a mom who is home every day with the kids is simply worth more than what this job has to offer.