Alaska Air Group, Inc. EXHIBIT 11 Computation of Earnings Per Common Share (In thousands, except per share) Three Months Ended Six Months Ended June 30, June 30, 1997 1996 1997 1996 PRIMARY - Net income $20,800 $17,980 $15,100 $10,795 Average number of shares outstanding 14,576 14,324 14,533 14,012 Assumed exercise of stock options reduced by the number of shares purchased with the proceeds from exercise of such options 136 202 116 146 Average shares as adjusted 14,712 14,526 14,649 14,158 Primary earnings per common share $1.41 $1.24 $1.03 $0.76 FULLY DILUTED - Net income $20,800 $17,980 $15,100 $10,795 After tax interest on convertible debt 1,889 2,009 3,758 4,019 Income applicable to common shares $22,689 $19,989 $18,858 $14,814 Average number of shares outstanding 14,576 14,324 14,533 14,012 Assumed exercise of stock options 162 202 171 229 Assumed conversion of 6.5% debentures 6,151 6,151 6,151 6,151 Assumed conversion of 7.75% debentures 0 381 0 381 Assumed conversion of 6.875% debentures 1,608 1,608 1,608 1,608 Average shares as adjusted 22,497 22,666 22,463 22,381 Fully diluted earnings per common share $1.01 $0.88 $0.84 $0.66