[dahart]

Paid maternity leave is an actual expense, if it happens. But you were talking about salary. And it is unfair and discriminatory when equally capable women are paid less than men, regardless of the reason it happens, and there are many other reasons than the probability of a woman having a child.

While those facts are true, they don't improve the quality of your analogy, the situation you're bringing up does not stack up the same way as (theoretically) charging someone per pound to fly on a plane. There might be reasons that charging by weight is discriminatory, but you're not convincing me.

[dragonwriter]

> There might be reasons that charging by weight is discriminatory

Charging by X is always discriminatory (on the basis of X), the questions are whether it is morally or legally acceptable discrimination, not whether it is discrimination at all.