...Air Transport Services Group, Inc. (ATSG) maintains a strong position as one of the world's leading providers of air cargo fleet leasing and related services, including crew, maintenance and insurance (CMI) services. ATSG's credit challenges include its high customer concentrations. As of 31 December 2023, the US Department of Defense (DOD), Amazon, and DHL accounted for 34%, 30% and 12% of revenues, respectively. This challenge is partially offset by the benefits from the high credit quality of these customers and their long- term need for the services provided by ATSG. Positively, we view Amazon's 19.5% minority interest in ATSG results in an alignment of interests that reduces the risk that Amazon's business relationships with ATSG will diminish. Although ATSG's debt-to-EBITDA leverage has increased due to weaker-than-expected operating performance, leverage was relatively modest at 3.1x as of 31 December 2023, and we expect that it will rise only modestly although it is vulnerable to...