ABX Air Inc. told investors Monday that its hub services agreement with DHL will be renewed for another year.

The accord, which calls for the subsidiary of Air Transport Services Group Inc. (NASDAQ: ATSG) to manage the express delivery company's 16 U.S. sorting centers, automatically renews yearly unless either company notifies the other 90 days before an Aug. 15 deadline that it intends to end the agreement. ABX Air, based in Wilmington, has been handling sorting, maintenance and logistics work for DHL under the accord since 2003.