I admit I have my racist biases. When a group of rowdy black males gets on a bus I'm on, I get a little nervous in a way that I would not if the group were white males. If I'm in a neighborhood where I'm the only white person I see, I act a little more polite and try to be a little more inconspicuous. I feel threatened and uncomfortable.
I just can't see myself, however, refusing to fly because someone of a different race was also on the plane. I might notice the person, might even think to myself, "that guy looks like a terrorist." But making the leap to "I must get off this plane?" I can't imagine it. I imagine I'd look at anyone suggesting such as if they were a little less in touch with reality than the average person.
And I'm sorry, what century are we living in again?