Amazon Prime Air is aiming for drone delivery to be available in 500 U.S. cities by the end of 2026 but even as it expands its service rivals threaten to fly even higher.

Prime Air delivers millions of items in as fast as 30 minutes and will reach communities with tens of millions of customers by year-end.

SAN FRANCISCO, Aug 19 : Amazon said on Wednesday it will expand its drone delivery service to reach hundreds of U.S. cities and towns by year end, up from 11 locations where it…