Automatic US visa revalidation - boarding pass in Canada

Recent experience (from late May, 2018) with crossing the border on AVR (by land):

• I planned my trip such that I would be driving through the border of Canada, south of Calgary, into Montana. I wanted to visit the Glacier National Park and therefore picked the border crossing site closest to it; it is called Chief Mountain, https://www.cbp.gov/newsroom/local-media-release/cbp-announces-opening-port-chief-mountain-0
• I arrived there and found out that it was "class B" border crossing site and that I needed to go to "class A" sites with AVR. The closest sites were https://www.cbp.gov/contact/ports/piegan-mt and https://www.cbp.gov/contact/ports/area-port-sweetgrass-montana-3310. I chose to go to the former since it was closer.
• There, I was allowed into the country with no problem. I only showed my passport, EAD, and I20. I told them where I worked, as well as what I did in Canada (i.e. presented a paper at a conference), and they let me go. Btw, I spent the total of 7 days in Canada, but they didn't even ask about that (I assume, they saw the information about when and where I entered Canada in their system).

To summarize, I was nervous about AVR (from reading posts about delays and unfamiliarity of some officers with AVR and also hearing such stories from my university's internal students advisor) but it worked as expected. Before your trip, maybe check with a specific site about this class A/B distinction and make sure that they can indeed handle AVR; if it is difficult to confirm that, consider changing your route to avoid small (and/or seasonal) ports of entry, like the one I tried to use first.

I just experienced this with Alaska Airline at Vancouver Airport. I had to check in at the Airline desk as the check-in machine does not allow me to check-in online. The agent could not print my boarding pass as their system told her that my visa is expired. But I can not go to the Customer Boarder Protection unless I have a boarding pass. The airline agent have absolutely no idea on what is automatic revalidation, either her manager. I had ended up to have my lawyer talked to the agent manager and she managed to print my boarding pass (by then, my original flight had took off and the new flights is 9 hours later arrival time). When passing me the boarding pass, the agent's manager still have confusion and told me she use her name to generate those tickets. I am not sure if this is only for Alaska airline or other airlines are the same. But I will check the airline first to make sure they understand what is AVR so there is no delays.

August 2019: Automatic Visa Revalidation (AVR) experience for expired F1 visa.

I departed to Victoria, British Columbia on July 26, 2019. My US visa expired on June 12, 2019. I stayed for 8 days and returned to the U.S. via Edmonton Airport.

I travelled from Victoria to Edmonton on August 04, 2019. When I arrived to Edmonton, there was a separate entrance for US connections. There, I scanned my boarding pass to enter. Then I went onto security (double layer despite security from Victoria). After passing security, I went onto Customs and Border Protection.

The man at the kiosk asked for my passport. He said that my visa had expired. Then I told him about AVR. He took me to a separate room behind the kiosk to another employee. I gave my new passport, old passport (with expired visa) and I-20. The man returned my passport in 10 minutes with a stamp on my expired visa page. Written on the stamp were my visa class (F1) and my date of expiration (D/S).

After that, I went to check-in to my gate. I was flying Delta. However, there was a problem with the system. I kept on reading my visa as expired despite the AVR approval / extension. This took about 30 minutes to figure out. In the end, they overrode the system in order to print my boarding pass and finally allowed me in.