From the AS Blog:

We take the use of masks and face coverings very seriously, like we do for any safety, health and well-being issue for our guests and employees.

Overwhelmingly, those who fly with us understand and appreciate the importance of wearing masks and face coverings during this time of COVID-19. We also rely heavily on our guests to do the right thing for the greater good of everyone onboard our flights.

Our flight crews encounter moments when some travelers disregard or disobey our mask requirement. It creates tension and anxiety for many of our passengers who do have their face coverings on. So, a change is needed.

Starting in early July, our flight attendants will be empowered to issue a final notice to any guest who repeatedly refuses to wear a mask or face covering on board our aircraft. With that warning – in the form of a yellow card handed to them – the guest’s travel with us will be reviewed and could be suspended for a period. That would be a decision we do not take lightly. By working together, we do more for the common good.

As part of a final warning, this yellow card could be issued to a guest who repeatedly refuses to wear a mask or face covering on our aircraft.

(Full post here:https://blog.alaskaair.com/coronavir...k-enforcement/)