I don't think he knew the woman on the plane. I think he just saw her and said hello and she smiled back. In her smile he saw that she shared his faith. I don't think that they usually see other Christians on their trips or something like that ("I knew that something’s different today", "You seem so different to me"). Eh, I'm not sure. I guess I agree with the first guy, except for them knowing each other.
I don't think he knew the woman on the plane. I think he just saw her and said hello and she smiled back. In her smile he saw that she shared his faith. I don't think that they usually see other Christians on their trips or something like that ("I knew that something’s different today", "You seem so different to me"). Eh, I'm not sure. I guess I agree with the first guy, except for them knowing each other.