Amazon considers airports as ideal locations for its Amazon Go stores.

Amazon Go may be bringing its frictionless checkout grocery-store model to airports.

According to Reuters Amazon is sizing up potential U.S. airports as spots for its Amazon Go concept.

To date, Amazon has opened seven Amazon Go locations in Seattle, San Francisco and Chicago. Shoppers use the app to enter the store. Then, the store uses sensors and cameras to monitor what customers put in their carts and charges them for items as they exit—no checkout required.

A foray into airports could help Amazon build awareness among customers about its Amazon Go service, but operating in airports in not without challenges. Reuters pointed out that numerous security clearances would be necessary, and public airports can require public bids for retail space.

Amazon has reportedly reached out to Los Angeles International and San Jose International Airport. Both told Reuters, Amazon would need to undergo a competitive bid process and neither have been in further communication with the company.