Ok, Let's focus on these answers that you have wider selection sets to make a mental image over than just people you know.
That would be 1-5, and 10.
1)
You say that you have never heard a female pilot over the intercom. How strongly does this paint the image that pilots are all male? (Or, how shocked would you be to hear a female pilot informing you of mid-air turbulence?) Would you say this would be encouraging for women to become pilots?
According to the Airline Pilots Association, only 5% of commercial aircraft pilots are female.
CNN has a story that tries to address some of the issues that might be involved in why there is a huge disparity there as well. Some of the reasons given are less likely to apply, given the statistical increase in women choosing careers over family in recent decades, so take some of the answers with a grain of salt.
http://www.cnn.com/2011/TRAVEL...
2)
Prior to the 1980s, only 19% of flight attendants were male. In 2007 that number had risen to 26%. Some attribute this to progressive social policies that encouraged males to take up "less manly" careers, as many stories in that time period discussed issues such as daycares operated by male caregivers, and other "controversial" subjects, which helped push back against the perception that flight attendant is a female job.
http://www.prb.org/Publication...
http://www.spiegel.de/internat...
(A german article from Speigel circa 2012 concerning efforts in Germany to recruit more male childcare workers.)
http://www.boston.com/communit...
(An Op-Ed concerning the "Controversial" practice of leaving children in a male care-giver's custody, circa 2009)
Exactly how much impact the "Softening" of social reactions to males entering "Traditionally Female" occupations has had on the uptick in males serving as flight attendants is not known, and probably cannot be well known, but I would expect that it is at least partially attributable, as the societal reaction towards a male entering such a career has relaxed somewhat in recent decades.
3)
According to the bureau of labor statistics, 51% of gas station employees are female. Granted, this value contains retail positions. The occupation of "Attendant" as it relates to gas stations typically involves this retail counter interaction these days, but the more historical view is of the guy outside who helped you at full service stations (a thing of the past, I know), which more parallels with automotive repair. The same statistics breakdown has 9.3% worksforce as female in automotive repair. Sadly, they don't give trend data, just snapshot data.
Depending on your perception of what "Gas station attendant" is, there is either a very slight lead for women in the industry, or a major lead by men in the industry.
4)
Labor statistics for "Retail Trade" have female participation (overall) listed at 48.3%. In various sub-categories, women dominate sales, while in others, men lead. Most hover in the 40-60%, with some leaning one way, and some to the other. Sales seems to be something that does not, intrinsically, have a gender bias, excepting in specailty products tailored or marketed to a specific gender.
5)
Labor statistics for "Administration of human resources" cites a 69% statistic for females. That's nearly 50% greater liklihood of your HR director being female over being male.
10)
Scientific research and development cites a 47% statistic.
Again, very close to 50% split.
There's other interesting data in there, concerning computer equipment manufacture-- 29% industry wide are female.
Compared to 28% overall for durable goods manufacturing (Of which computer parts manufacture is a subset)
More interesting is the breakdowns inside the overall durable goods sector-- Medical equipment manufacture is nearly a 50-50 split, at 57.9% male and 42.1% female employee statistics. This sector would include everything from cardiac pumps to rubber gloves. There would have to be some significant deviations both ways in the industry for some sub-segments of this market to swing one way, and others to swing the other, for it to level out this close to parity -- especially in light of the overall dominance males have in the durable good manufacture market. (What do you suppose the secret sauce could be?)