Dave Clark, CEO of Amazon’s worldwide consumer business, said Monday that the company is poised to become the largest U.S. package delivery service by early 2022, overtaking longstanding shipping rivals UPS and FedEx.

“We expect we will be one of the largest carriers in the world by the end of this year,” Clark told CNBC’s Becky Quick in an interview on “Squawk Box.” “I think we’ll probably be the largest package delivery carrier in the U.S. by the time we get to the end of the year, if not in early ’22.”

Amazon has been steadily building up vast logistics and fulfillment operations since a 2013 holiday fiasco left its packages stranded in the hands of outside carriers.