EX-11.1 Computation of Earnings EXHIBIT XI WILLIS LEASE FINANCE CORPORATION Computation of Earnings Per Share Three Months Ended Nine Months Ended September 30, September 30, --------------------- --------------------- 1998 1997 1998 1997 ------ ------ ------ ------ (in thousands, except (in thousands, except per share data) per share data) Income before extraordinary item Basic Earnings: Income before extraordinary item $2,484 $1,451 $6,582 $3,732 Shares: Weighted average number of common shares outstanding 7,280 5,447 7,245 5,441 ------ ------ ------ ------ Basic earnings per common share before extraordinary item $0.34 $0.27 $0.91 $0.69 Assuming Full Dilution Earnings: Income before extraordinary item $2,484 $1,451 $6,582 $3,732 ------ ------ ------ ------ Shares: Weighted average number of common shares outstanding and common stock equivalents 7,495 5,658 7,466 5,592 ------ ------ ------ ------ Earnings per common share assuming full dilution, $0.33 $0.26 $0.88 $0.67 ------ ------ ------ ------ before extraordinary item Net income Basic Earnings: Net income $2,484 $1,451 $6,382 $5,740 ------ ------ ------ ------ Shares: Weighted average number of common shares outstanding 7,280 5,447 7,245 5,441 ------ ------ ------ ------ Basic earnings per common share $0.34 $0.27 $0.88 $1.05 Assuming Full Dilution Earnings: Net income $2,484 $1,451 $6,382 $5,740 ------ ------ ------ ------ Shares: Weighted average number of common shares outstanding and common stock equivalents 7,495 5,658 7,466 5,592 ------ ------ ------ ------ Earnings per common share assuming full dilution $0.33 $0.26 $0.85 $1.03 ------ ------ ------ ------