I didn't check every place here, but it's likely the best place at salt lake city airport for vegan food.
They have everything clearly marked on the menu and have about 5 options stated with more possible. I have the vegan burger, but forgot to request carrots and celery or a side salad instead of chips. It was alright, but considering the other options in the airport it was good. They also have a quinoa salad that is vegan.