Reply #24: It depends entirely on the kid, but I would think most kids of 17 would be fine.

[Left Is Write]

My daughter didn't fly alone until she was 14-ish, though I think she would have been fine at 13.

However, I don't have any basis for deciding whether your father is "unreasonable." All I can suggest is that you talk to him and ask him to articulate his reasons for believing you too young, and see if you can work out accommodations between the two of you to address those reasons.