WILLIS LEASE FINANCING CORPORATION AND SUBSIDIARIES Exhibit 11.1 Computation of Earnings COMPUTATION OF EARNINGS PER SHARE Three Months Ended March 31 ------------------------------------------- 2000 1999 -------------------- -------------------- (in thousands, except per share data) Net income Basic Earnings: Net income $1,682 $2,785 ==================== =================== Shares: Average common shares outstanding 7,402 7,363 ==================== ==================== Basic earnings per common share $0.23 $0.38 ==================== =================== Assuming Full Dilution Earnings: Net income $1,682 $2,785 ==================== =================== Shares: Diluted average common shares outstanding 7,484 7,450 ==================== =================== Earnings per common share assuming full dilution $0.22 $0.37 ==================== =================== Supplemental information: Difference between average common shares outstanding to calculate basic and assuming full dilution is due to options outstanding under the 1996 Stock Options/Stock Issuance Plan and warrants issued in conjunction with the initial public offering 19