Air Transport Services Group Buys Charter Airline for $845 Million

Deal would help company expand services for customers like Amazon, satisfy growing e-commerce sector

A major flyer of parcels for Amazon.com Inc. on Tuesday said it could expand its e-commerce business more rapidly after acquiring the airline that is the Pentagon’s largest troop carrier.

Air Transport Services Group Inc. said it plans to buy Omni Air International LLC for $845 million in cash, adding a passenger airline best known for flying troops and professional sports teams to its freight-focused business.

The...