Quoting from their online menu:
“We're conscious about what you can and can't eat. While we take meticulous care to please gluten-free Jet’s® lovers, this pizza may have been exposed to gluten from other foods in our kitchen. For that reason, we don’t recommend it for those with celiac or similar diseases & caution customers with gluten sensitivities.”
— Gluten-free items are marked on the main menu
— Not Much/None