I assumed at first that the other country was China, and I would strongly recommend that one not enter China on a Chinese passport subsequent to having attained Canadian citizenship.
However, on reading this thread, it appears that Malaysia also does not permit dual citizenship. Are there other Asian countries that also do not allow this?

Plenty of Asian countries do not allow dual citizenship, to varying degrees, including:

- Burma
- China
- India
- Indonesia
- Japan
- Malaysia
- Nepal
- Pakistan
- Singapore

My wife does this all the time, and every airline we fly on departing Canada does not care nor ask what our residency status is here. AC will not ask.

My other citizenship is Malay. So, your friend always use HK as a proxy when travelling Canada-guangzhou (china)? I think I'm going to do the same thing to be save. My initial plan of going directly to MY is to save airplane ticket from country-B to MY. Not worth the risk I guess.

My other cizitenship is indeed Malay. Just curious, what's so risky with China as you said above? Is it because Canadian govt tells China of any chinese that acquire Cadn citizenship? Or China has some kind of super-secret-surveillance on all of its citizen all over the world?

Just wondering, [MENTION=869134]KDS777[/MENTION], [MENTION=3344]airoli[/MENTION], are your non-canadian passports from countries that are allowed to visit Canada short-term without any visa?

My other passport is malaysian, and malaysians are required to have an entry visa to canada, even for tourism < 30 days. And I read somewhere (forgot exactly where, could be wrong) that airline check-ins in Canada double as exit control for CBSA (canadian border security agency) since canadian airports don't have an exit immigration control. Maybe I'm just being overly paranoid here.

The only such passport left is the US one. All others now require either an eTA or an actual visa.

. I don't know if this is true but even if it was, it still would not matter. Leaving Canada on any passport is not a crime. And when you enter Canada, you show your Canadian passport - always. And that's that. Yes.

I will just add last time I left Canada to fly to the UK, I showed my UK passport at boarding. They would not let me board until they saw my Canadian passport as well, as I was flying on a return ticket. This is the first and only time this has happened to me (normally I fly on the passport of the country I am flying to, and am allowed dual nationality) but I thought I should mention it happened in case it is relevant to the OP.

Mh1993

Visas are required for her passport. But as she also has a Canadian passport it is a moot point.

"Just curious, what's so risky with China as you said above?"

There are a lot of people, especially in the U.S. and Canada, who keep their Chinese passport and ID card after getting another citizenship because it makes life in China so much simpler when they visit. The Chinese authorities are aware of this practice and are alert, at least sometimes, to detect those engaged in it.

Only obliquely relevant to the OP. In your case, you had to show your Canadian passport because, as a Canadian citizen, you must travel to Canada on your Canadian passport. (We will set aside the fact that Canadian immigration would have to let you into the country regardless of your passport issue if they establish that you are a citizen, as you would never have had the opportunity to present yourself to them since you'd not have been allowed on the plane.) The fact that you were on a return ticket was not relevant to the requirement to show your Canadian passport.

But travelling TO London, England, surely the airline only cares that I am admissible to the UK (not that I can return to Canada on a different flight a few weeks later)? It's the only time I have been asked to show proof that I can take the return leg of a flight at a later date.

Sorry, mea culpa. I misread your post that you were flying UK->Canada. My post makes no sense otherwise!