200 7 Delta Air Lines 2004 post mer ger appr oval 2003 2000 2000 2000 199 5 1990 Nor th west Airlines 1990 199 3 Pan Am pur chases R epublic 1986 1987 ac quir es tr ans atlantic and shuttle r out es 1991 1985 1980 Delta Air Lines Republic Airlines 1980 ac quir es W est ern Airlines 198 7 mer ger: Nor th C entr al & Southern Airw ays 19 79 pur chases Hughes Airw est 1980 1963 Hughes Air W est pur chased b y Ho war d Hughes 19 70 Nor theast Airlines 197 0 mer ges with 197 0 1969 1962 Delta Air Lines 19 72 Air W est West ern Airlines mer ger: P acific, Bonanz a, mer ge with P acific West C oast 1968 1959 1960 Nor thern Airlines 196 7 1960 1963 19 55 Delta Air Lines Pacific Air Lines dba Delta – C & S name chang e 19 58 1958 19 53- 19 55 Nor th C entr al Nor th west Orient Airlines West C oast Airlines Nor th west Airlines name chang e 19 52 pur chases Empir e Airlines 19 52 rebr anded 19 49- 1986 19 53 19 50 Pacific 19 50 C & S Air Lines West ern Airlines Nor thern Empir e Airlines mer ge with Delta 19 53 name chang e 19 41 Airlines mer ger: Zimmerly & absorbs subsidiary name chang e Southern West C oast Empir e 19 46 1948 Inland Air Lines 19 52 19 45 1947 Airw ays Airlines 19 46 1949 Delta Air Lines South west O N S Pacific C EMPIRE AIRLINES I Airw ays Airline F eeder S official name chang e 19 45 N Nor thern I Syst em 19 37-19 39 W 19 46 Bonanz a C Airw ays L E Air Lines ac quir ed b y N A 1945 19 40 Nor theast name chang e T R 19 45 19 40 Airlines Nor theast Airlines Wisc onsin Zimmerly Empir e 19 44 19 45 name chang e 19 40 Centr al Airlines Airlines Airlines 19 44 19 44 19 44 Inland Air Lines Oper at ed jointly West ern name chang e Ma yflo wer Airlines Air Expr es s by 19 36, ac quir ed b y Chicag o & Southern 19 38 Zimmerly Air name chang e 19 34 Transpor t 19 38 National Airw ays Nor theast Airlines Delta Air Lines Air Lines 19 33 19 44 restar t pas seng er name chang e 19 35 Woodle y 19 34 Airw ays servic e 19 34 Gener al Air Lines Nor th west Airlines 19 32 name amended 19 34 1934 name chang e 19 34 National P ark s Airw ays Bost on-Maine Centr al V ermont Pacific Marine (Al F rank) 19 30 Airw ays Airw ays Delta Air Bor der Airlines Airw ays 192 2 Mid C ontinent 1927 -1937 Corpor ation mer ge with Pacific Seaboar d pur chased b y W est ern Air Expr es s 19 31 name adopt ed 19 30 Wyoming Air Airlines 19 33 Air Expr es s 19 28 Servic e 19 31 19 30 sold 19 32 19 30 West C oast Air Wyoming Nor th west Airw ays Delta Air Servic e 19 29 Transpor t 19 29 Air Servic e fir st pas seng er flight 19 27 inc orpor at ed 19 28 sold 19 31 19 30 Bost on-Maine fir st pas seng er flight 19 29 Standar d 1926 Airw ays Color ado Air Lines Nor th west Airw ays 19 31 Airw ays sold 19 30 West ern inc orpor at ed 19 26 Huff D aland Dust er s West ern 19 28 ac quir es Air Expr es s subsidiary of Huff 192 6 19 20 Daland Airplanes 19 24 rout e 19 27 19 20.