I'm all for it. As Stark mentions, I too am allergic to a lot of perfumes and I don't feel like being in a confined space while someone proceeds to spray themselves enough to smell like a whorehouse. I had to deal with that in high school with the catty girls who did it on purpose just to make me mad. I don't want to deal with it on a plane, where perfume isn't needed to begin with.
Spray it before you get on the plane so you smell nice but it's settled, or spray it when you land.