For non-NEXUS people who agonize with the machines at YEG when returning from outside the country (or who get caught behind an arriving KLM flight like I did yesterday and spent an hour to get to baggage...), apparently there is an app that you can complete in Airplane Mode that will generate a QR Code that is then scanned at a dedicated APP line at YEG that is in between the NEXUS line and the regular line.

Here is a link:

Wouldn't have helped me for the 10 minutes I was held at the top of the short escalators as the regular line was full with about 200+ people.