1 AIRCRAFT SERVICE INTERNATIONAL GROUP, INC. EXHIBIT 12.1 - STATEMENT RE: COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES Pro forma year ended Year ended December 31, March 31, 1993 1994 1995 1996 1997 1998 ----------------------------------------------------------- Pretax income (loss) from continuing operations $ 6,302 $ 8,157 $ 7,580 $ 6,652 $ 9,634 $ (833) Interest 151 158 620 606 669 8,850 Amortization of debt issuance costs -- -- -- -- -- 495 Interest portion of rental expense 998 965 864 839 830 830 ----------------------------------------------------------- EARNINGS $ 7,451 $ 9,280 $ 9,064 $ 8,097 $11,133 $ 9,342 Interest 151 158 620 606 669 8,850 Amortization of debt issuance costs -- -- -- -- -- 495 Interest portion of rental expense 998 965 864 839 830 830 ----------------------------------------------------------- Fixed charges $ 1,149 $ 1,123 $ 1,484 $ 1,445 $ 1,499 $10,175 RATIO OF EARNINGS TO FIXED CHARGES 6.5 8.3 6.1 5.6 7.4 0.9 Surplus/(Deficit) Earnings $ 6,302 $ 8,157 $ 7,580 $ 6,652 $ 9,634 $ (833) Pro forma six months Three months ended Six months ended ended March 31, September 30, September 30, 1997 1998 1997 1998 1998 ----------------------------------------------------------- Pretax income (loss) from continuing operations $ 2,514 $ 1,657 $ 5,338 $(3,006) $ (910) Interest 165 170 330 3,965 4,424 Amortization of debt issuance costs -- -- -- 2,531 302 Interest portion of rental expense 251 251 470 475 475 ----------------------------------------------------------- EARNINGS $ 2,930 $ 2,078 $ 6,138 $ 3,965 $ 4,291 Interest 165 170 330 3,965 4,424 Amortization of debt issuance costs -- -- -- 2,531 302 Interest portion of rental expense 251 251 470 475 475 ----------------------------------------------------------- Fixed charges $ 416 $ 421 $ 800 $ 6,971 $ 5,201 RATIO OF EARNINGS TO FIXED CHARGES 7.0 4.9 7.7 0.6 0.8 Surplus/(Deficit) Earnings $ 2,514 $ 1,657 $ 5,338 $(3,006) $ (910)