I think it depends on the trajectory. You could hear it if it's not flying directly towards you. But if I'm reasoning correctly, as long as it's following a str

I think it depends on the trajectory. You could hear it if it's not flying directly towards you. But if I'm reasoning correctly, as long as it's following a straight line path then even if it's not going directly at you, you could only hear it after it passes the point that is closest to you. So it would probably had to be turning.