You could use either/or. That was the point that started this thread, if you had a Canadian visitor's visa, you wouldn't need ETA or a Canadian passport. Even if you're Canadian.

Only the US as far as I'm aware requires the use of US documentation if you're a US citizen.

You can use your birth certificate at a Canadian POE if you want to, but you've got to get to the POE first, that's the trick.

Just came back from UK and not one person at Heathrow at check in or at the gate asked for PR cards to prove we had residency as we travelled on our UK passports. Each time we were asked for documents it was boarding card and passport only.

Conversely awhile back I had someone at check-in at T5 ask what legal permission I had to enter Canada until she actually bothered to realize she was holding my Canadian passport in her hand.

Probably because eTA is not fully in effect until 29/09/2016. So you got to board the "old" way just showing your UK passport as theoretically the airline is satisfied that you can enter Canada with just that. When I traveled with my British friend in March (with PR) upon leaving Paris/Orly at check in and the gate, she only showed her UK passport and was fine, then again at the gate in Heathrow she only showed her UK passport. But had eTA actually gone into effect on the 15th of March she would have been asked for her PR card.

Also, in my experience it doesn't matter what passport you show at the gate. I've checked into a return flight to Canada on my Canadian passport, then put it away and showed my Maltese one at the gates and not taken the Canadian one out again until immigration and i've been fine. But its always on me and accessible just in case they ask for it.

My latest question with regards to eTA is, what about children born abroad with dual citizenship who have not yet received proof of Canadian citizenship? Technically they are "already a Canadian citizen" but they don't have proof of such status to get a Canadian passport. Its been about 10 months since my aunt and uncle applied for Canadian citizenship certificates for their dual Maltese-Canadian children who were born in the UAE and Qatar, via the Canadian embassy in Rome. If they needed to travel to Canada, could they apply for an eTA in the kids' Maltese passports since they have no proof of them being Canadian citizens? What other recourse do they really have besides lying on the eTA application and saying they aren't Canadian citizens?

Hi guys,

i was discussing this with the embassy in london today .... their words:For travel to Canada on or before September 29, 2016, Canadian-UK dual citizens may travel on their UK passport (without an eTA).

High Commission.

You got someone on the phone at the High Commission?

Genuinely amazed. I didn't think they had phones.

Legally I think the correct procedure is to get a special travel document from the embassy.

This and many other quirky situations is why they delayed implementation.

Hahaha I have my connections

But how can they prove entitlement to such a document when you can't prove Cdn citizenship without a citizenship certificate, which they haven't yet received?

Using the same proof they came up with to register the child.

When Canada and the UK combined their embassies a few years ago I did wonder what would happen to the High Commission in London.

Why not just cut out the middleman and run it through the Foreign Office?