I have read everything I can find, but still don't have a definitive answer, so:
I am a dual citizen, USA and Australia. I am about to leave Australia, but just noticed my Australian passport is expired. Can I leave on my USA passport? I am not concerned about reentry, just the leaving part. If I ever want to go back (not planning on it now), I realize I will have to renew the Australian passport to do so.
I have read both "should leave on Australian passport" and "must leave on Australian passport", and the Australian High Commission in the UK says it is possible- Q: I am an Australian citizen but as I did not obtain an Australian passport before departing Australia," ...... A: "In the absence of an Australian passport, airlines are unable to assess a person's claim to Australian citizenship at the time of check-in and may decline to carry the traveller. It would therefore be in your best interests to apply for an Australian passport to enable you to return to Australia."
Does anybody have first-hand knowledge of what happens? Would I actually be denied the ability to return to my country? Would I just become a prisoner in Australia destined to live in the airport or at the US embassy?
I've read all the 'should-s' and 'must-s', but what actually happens if you do try to leave on your foreign passport?