Here's a truly enlightening post from the Five Thirty Eight blog about the percentage of male workers in major US job sectors. The discussion was started by a reader asking a question about how many male flight attendants there are compared to past years. The answer just might surprise you (ok, now that I said that, maybe it won't).
Here's the breakdown of male workers as charted by Five Thirty Eight. Not a whole lot of female boilmakers I guess. But yes, plenty of male flight attendants -- even if you don't see them on your flights.