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naw, blue has become very gender neutral in the past few years. Many girls/women like blue. I think it would be ok to make a baby's room blue
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Blue as a color for girls/women is very common & neutral, but blue on a baby still means 'boy'. Unless you want people saying "Oh, what a beautiful little boy", don't dress your baby girl in blue! (At least until they're toddler-sized)
As for having airplanes in the nursery, we got a airplane bumper for the crib when I was only 3 or 4 months along. I didn't care if it was a boy or girl, that baby was going to have airplanes in his/her room! We have airplane toys, airplane books, airplanes on clothes & airplanes on bedding. My kids are either going to love or hate airplanes!