Originally Posted by bt_yyz

I am a Canadian citizen with NEXUS and I'll be travelling to the US in the next couple days. However, I am applying for a visa (foreign country, not US) so I plan to travel WITHOUT my Canadian passport.

From YYZ, I will fly UA and then 3 other domestic US flights on UA (I guess I could use a drivers lic, or NEXUS), and then AC to fly back to Canada.
Is this an issue with airline GAs? It appears that CBP and CBSA are fine for using NEXUS as ID, proof of citizenship, entry document, etc. But a bunch of other forum threads have mentioned problems with GAs.

Should I have any concerns? Otherwise I will have to bring my passport and pay extra for rush/expedited visa application.