Exhibit 21.1

Air Transport Services Group, Inc.

List of Significant Subsidiaries

December 31, 2012

1. ABX Air, Inc., a Delaware Corporation

2. Airborne Global Solutions, Inc., a Delaware Corporation

3. Airborne Maintenance and Engineering Services, Inc., a Delaware Corporation

4. Air Transport International, Inc., a Delaware Corporation

5. Air Transport International Limited Liability Company, a Nevada Limited Liability Company

6. AMES Material Services, Inc., an Ohio Corporation

7. Capital Cargo International Airlines, Inc., a Florida Corporation

8. Cargo Aircraft Management, Inc., a Florida Corporation

9. Cargo Holdings International, Inc., a Florida Corporation

10. LGSTX Services, Inc., a Delaware Corporation

11. LGSTX Distribution Services, Inc., an Ohio Corporation