Discrimination? Listen mate, I have the choice of hiring whichever bloke I see fit. There is no law stating that I have to hire you simply because you say you're gay. It's still my choice. And if it comes down to a choice between two pilots of similar qualifications, and one of them happens to be gay, would you sue me for selecting the one whose sexuality I am not aware of?
Just keep your sexuality to yourself. Believe me Mary, if you're like all the other militant gays out there, it'll become obvious soon enough. Then if I fire you for being gay - well, you can sue me then.