EXHIBIT XI Computation of Earnings Per Share WILLIS LEASE FINANCE CORPORATION AND SUBSIDIARIES Computation of Earnings Per Share Years Ended December 31, 1998 1997 1996 --------------- -------------- --------------- (in thousands, except per share data) INCOME BEFORE EXTRAORDINARY ITEM Basic Earnings: Income to common shares before extraordinary item $9,451 $5,330 $2,804 Shares: Weighted average number of common shares outstanding 7,266 5,497 3,756 --------------- -------------- --------------- Basic earnings per common share before extraordinary item $1.30 $0.97 $0.75 Assuming Full Dilution Earnings: Income to common shares before extraordinary item $9,451 $5,330 $2,804 Shares: Weighted average number of common shares outstanding and common stock equivalents 7,461 5,673 3,788 --------------- -------------- --------------- Earnings per common share assuming full dilution before extraordinary item $1.27 $0.94 $0.74 NET INCOME Basic Earnings: Net income to common shares: $9,251 $7,338 $2,804 Shares: Weighted average number of common shares outstanding 7,266 5,497 3,756 --------------- -------------- --------------- Basic earnings per common share $1.27 $1.33 $0.75 Assuming Full Dilution Earnings: Net income to common shares $9,251 $7,338 $2,804 Shares: Weighted average number of common shares outstanding and common stock equivalents 7,461 5,673 3,788 --------------- -------------- --------------- Earnings per common share assuming full dilution $1.24 $1.29 $0.74