RAYTHEON COMPANY P59 333 333 which can generally be recovered through the pricing of products and services to the U.S. government. Previously, the Company’s individual segment results included FAS pension expense or income, which consisted of CAS pension expense and an adjust- ment to reconcile CAS pension expense to FAS pension expense or income. Information for all periods presented was restated to reflect these changes. Segment net sales and operating income generally include intersegment sales and profit recorded at cost plus a specified fee, which may differ from what the selling entity would be able to obtain on external sales. Corporate and Eliminations include Company-wide accruals and over/under applied overhead that have not been attributed to a particular segment and intersegment sales and profit eliminations. Segment financial results were as follows: Intersegment sales in 2003, 2002, and 2001, respectively, were $140 million, $103 million, and $105 million for Integrated Defense Systems, $52 million, $35 million, and $26 million for Intelligence and Information Systems, $7 million, $1 million, and $1 million for Missile Systems, $316 million, $218 million, and $223 million for Network Centric Systems, $402 million, $298 million, and $320 million for Space and Airborne Systems, $529 million, $590 million, and $537 million for Technical Services, and $2 mil- lion, $3 million, and $4 million for Aircraft. Aircraft net sales do not include intersegment aircraft sales to FO. Aircraft operating income does not include profit on interseg- ment aircraft sales to FO until the underlying aircraft has been sold by FO. Free Cash Flow (In millions)  2003 2002 2001 Integrated Defense Systems $ 318 $ 194 $ 127 Intelligence and Information Systems 88 121 43 Missile Systems 244 176 293 Network Centric Systems 115 88 59 Space and Airborne Systems 365 153 215 Technical Services 104 174 (57) Aircraft 20 24 (316) Other (55) (61) (134) Corporate 377 770 (51) Total $1,576 $1,639 $ 179 Operating Income (In millions)  2003 2002 2001 Integrated Defense Systems $ 331 $ 289 $ 238 Intelligence and Information Systems 194 180 139 Missile Systems 424 373 257 Network Centric Systems 19 278 246 Space and Airborne Systems 492 428 339 Technical Services 107 116 123 Aircraft 2 (39) (77) Other (34) (12) (758) FAS/CAS Pension Adjustment (109) 210 386 Corporate and Eliminations (110) (40) (127) Total $1,316 $1,783 $ 766 Net Sales  (In millions)  2003 2002 2001 Integrated Defense Systems $ 2,864 $ 2,366 $ 2,265 Intelligence and Information Systems 2,045 1,887 1,736 Missile Systems 3,538 3,038 2,901 Network Centric Systems 2,809 3,091 2,865 Space and Airborne Systems 3,677 3,243 2,738 Technical Services 1,963 2,133 2,050 Aircraft 2,088 2,040 2,471 Other 573 210 207 Corporate and Eliminations (1,448) (1,248) (1,216) Total $18,109 $16,760 $16,017