Much attention has been directed toward Walmart, Amazon Prime Air and Alphabet subsidiary Wing’s forays into drone delivery — perhaps rightfully so given some of the things those companies have built in the past. But looking beyond drone delivery’s trio of titanic names, other firms are subtly carving out their own sizable presence in the space.
Take, for example, South San Francisco-based Elroy Air, which on Wednesday announced that it now has more than $2 billion worth of orders for Chaparral,...