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However, that does not stop ill informed people (including airline staff/agents at check in) from apply a blanket six month rule to all PAX irrespective of destination.
I probably wouldn't travel on a 6 month passport for this reason alone.
When my old passport was about to expire I had virtually everyone who saw it um and ah it (apart from customs officials who knew the rules, even then they warned me that some countries wouldn't accept it any more). I got a little tired of saying "it's fine, I checked the rules for (insert country here), and it's allowed"
IMHO the 6 month rule is about the most stupid rule I've ever seen. I can't think of any other sort of credential that actually expires well before the published expiry date. I can almost imagine a conversation about car rego nearing expiry going something like this.
Copper: Do you know why we pulled you over?
Me: No
Copper: Your rego has expired
Me: No it hasn't, it doesn't expire until next Tuesday
Copper: Well yes, technically that's true, but you see you might drive the car on Wednesday without getting it re-registered before then
Me: But I have every intention of re-registering the car before the rego expires
Copper: Yes, but you might not, and despite the fact it's registered now, and everything is still legal, we're still going to fine you just in case you decide to drive it after next Tuesday without getting it registered first.