X0306 4 2016-03-10 0 0000894081 Air Transport Services Group, Inc. ATSG 0001374566 MESDAG WILLEM C/O RED MOUNTAIN CAPITAL PARTNERS LLC 10100 SANTA MONICA BOULEVARD, SUITE 925 LOS ANGELES CA 90067 0 0 0 1 Please refer to Remarks below 0001374603 RED MOUNTAIN PARTNERS, L.P. 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 1 0 0001374588 RED MOUNTAIN CAPITAL PARTNERS LLC 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 0 1 Please refer to Remarks below 0001374606 RMCP GP LLC 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 0 1 Please refer to Remarks below 0001374607 RED MOUNTAIN CAPITAL MANAGEMENT INC 10100 SANTA MONICA BOULEVARD SUITE 925 LOS ANGELES CA 90067 0 0 0 1 Please refer to Remarks below Common Stock 11152425 I See footnote 1 and Remarks below Restricted Stock Units 2016-03-10 4 J 0 5212 A Common Stock 5212 83141 I See footnote 6 and Remarks below These shares are held by Red Mountain Partners, L.P. ("RMP). The restricted stock units (the "Units") will be exchanged for common stock on a one-for-one basis. The Units will not be settled until Mr. John Christopher Teets's board service ends. See footnote 6. There is no expiration date. The price will be determined when Mr. Teets's board service ends. These shares are held by Red Mountain Capital Partners LLC ("RMCP LLC"). Mr. Teets, who is a Partner of RMCP LLC, was awarded the Restricted Stock Units reported hereunder in connection with his service on ATSG's board of directors. Mr. Teets transferred the economic value of these RSUs to RMCP LLC. This Form 4 is jointly filed by (i) RMP, (ii) RMCP GP LLC ("RMCP GP"), (iii) RMCP LLC, (iv) Red Mountain Capital Management, Inc. ("RMCM"), and (v) Mr. Mesdag. RMCP GP is the general partner of RMP. RMCP LLC is the managing member of RMCP GP. RMCM is the managing member of RMCP LLC. Mr. Mesdag is the president, sole executive officer, sole director and sole shareholder of RMCM. Each of Mr. Mesdag, RMCM, RMCP LLC, and RMCP GP, by virtue of their direct or indirect control of RMP may be deemed to beneficially own some or all of the securities reported as being held by RMP. In addition, each of Mr. Mesdag and RMCM, by virtue of their direct or indirect control of RMCP LLC, may be deemed to beneficially own some or all of the securities reported as being held by RMCP LLC. Each of the reporting persons hereunder disclaims beneficial ownership of the reported securities except to the extent of its or his pecuniary interest therein. This Form 4 shall not be deemed to be an admission that any reporting person hereunder is the beneficial owner of any of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. /s/ Willem Mesdag, on behalf of himself and each of the other reporting owners 2016-03-16