United IAD-YUL and Air Canada YUL-IAD. Same ticket.

UA would've asked to see NEXUS card or passport before letting you onto the flight to YUL.

AC should've also asked before letting you onboard flight to IAD. I'm betting agent wasnt paying attention if they let you board without showing ID. I fly AC between YYZ/SAT and have never had them not ask for ID.

Just thought I'd add an FYI answer to this. Logged in to TTP website today to check status of my renewal (always 'awaiting review'... sigh) and there was a new banner alert that said anyone with conditional approval who is able should just walk in to an office for interview because of ongoing backlog. [EDIT: I had the page open still, here it is verbatim: "Conditionally approved GE members should seek to complete their GE interviews without an appointment upon arrival from an international flight at any of the 49 airports participating in CBP's Enrollment on Arrival (EoA) program." I'd certainly add that this probably can happen at a land crossing as well, or at least I'd try! And admittedly it says GE but guessing applies also to Nexus?]

I'm fairly certain I hadn't seen that message the last time I logged in to check (maybe a week ago?), so thought it worth posting here.

Separate post for different issue (moderator feel free to move if this is not the right place - the threading seems to have changed while I was inactive!).

I applied for renewal of my Nexus after expiry (long story, good reasons). I didn't expect to be traveling to/from Canada regularly and when I went into a Nexus office at YUL I wanted to ask about renewal after expiry. I had my Nexus card with me and they insisted on taking it from me, because it had expired. They gave me a photocopy.

However, I was chatting with the American CBP agent at Cape Vincent (little ferry border crossing) and he said people use expired ID frequently for proof of citizenship and that is acceptable. It wasn't the first time I had heard that - I may even have seen posts that confirm it in the old thread(?). So, should the CBP officer who took my card at YUL have let me keep it? (I thought about claiming I didn't have it on me, but am not a good liar at all!)

Enrollment on Arrival only applies to Global Entry applicants, not NEXUS. NEXUS requires you to be interviewed by officer from both U.S. and Canada.

I regularly fly LGA-YYZ on Air Canada and they always ask to see a passport or NEXUS ID before boarding the plane both at LGA and at YYZ

Don’t know if airport workers in precleared area of airport need to be US admissible. But without ID check, it is conceivable airport worker can conspire with a pre cleared passenger to fly into US.

To my knowledge, airport employees working in US Precleared Areas ie Customs Controlled Areas need to have background checks with US Authorities. As far as boarding, that particular employee would not likely have their entry into the United States recorded if there was a conspiracy, but they are subject to CBP and more officially CBSA inspection when entering and leaving the CCA.

Updating a new passport in NEXUS when it can't be done online
 

My NEXUS enrollment is valid until 2021. My US passport expired earlier this year and I just received the new passport recently. I was unable to update my passport information on the TTP website; I got an error message that I had to go to a "CBP enrollment center" on a walk-in basis so an agent could do this. So I go to the CBP Global Entry office at EWR and the agent there says I need to go to a NEXUS enrollment center. I tried to call the one in Champlain, NY to see if they accept walk-ins but I was never able to get through to a live person or receive a reply to my voice mail. Can anyone confirm that updating NEXUS with a new US passport can be done on a walk-in basis at a NEXUS enrollment center? Thank you.

I was successful in updating my passport by e-mailing a scan of the photo page of it to [email protected] from the e-mail on file.

Dumb question but...
 

Traveling by car Canada to USA new nexus card holder .Can I take whey protein powder with me ?

Are there any US credit cards that will reimburse Nexus?

Not at the present time.

Is there any way to get announcements for NEXUS Mobile Enrollment events? I know there were two recently in Los Angeles, one in Fall 2018 and one in Spring 2019, and a number of others in different non-border cities. However I only find out about these after the fact. My GE expires in 2020 and I would like to plan if I can get to a Mobile enrollment event to switch to NEXUS or if I need to renew GE.

I called AMEX (Platinum card) and complained and they agreed to reimburse me $100 for Nexus for me and my wife - when we first applied for Nexus it automatically reimbursed the $100 (two people), it was five years later when we renewed Nexus that it didn't reimburse and I had to call. If a card reimburses $100 for GE they should reimburse up to $100 for Nexus (Nexus includes GE).