. ▁Two ▁other ▁bases ▁were ▁also ▁built ▁nearby : ▁Ryan ▁Field , ▁located ▁west ▁of ▁T uc son , ▁and ▁the ▁Mar ana ▁Field , ▁located ▁north ▁of ▁T uc son , ▁near ▁the ▁town ▁of ▁Mar ana . ▁ ▁In ▁February ▁ 1 9 4 1 , ▁the ▁city ▁of ▁Phoenix ▁purchased ▁ 1 , 4 4 0 ▁acres ▁of ▁land ▁for ▁$ 4 0 , 0 0 0 ▁and ▁then ▁le ased ▁it ▁to ▁the ▁federal ▁government ▁for ▁$ 1 ▁a ▁year . ▁In ▁March , ▁Del ▁Web b ▁Const ruction ▁began ▁building ▁what ▁would ▁become ▁the ▁largest ▁f ighter - training ▁base ▁in ▁the ▁world . ▁Luke ▁Field , ▁which ▁was ▁named ▁after ▁Arizona ' s ▁World ▁War ▁I ▁ace , ▁Frank ▁Luke , ▁cost ▁$ 4 . 5 ▁million ▁and ▁was ▁used ▁mainly ▁for ▁advanced ▁flight ▁training . ▁So on ▁after , ▁the ▁Go ody ear ▁A ircraft ▁Corporation ▁established ▁a ▁large ▁plant ▁west ▁of ▁Phoenix ▁to ▁build ▁parts ▁for ▁combat ▁aircraft ▁while ▁the ▁Gar rett ▁Corporation ▁built ▁the ▁A i Res earch ▁plant ▁inside ▁Phoenix ' s ▁Sky ▁Har bor ▁to ▁make ▁parts ▁for ▁the ▁B - 1 7 ▁bom ber . ▁Other ▁manufact ur ers ▁eventually ▁set ▁up ▁shop ▁as ▁well , ▁including ▁the ▁All ison ▁Ste el ▁Company ▁and ▁Al co a . ▁ ▁Th under bird ▁Field ▁No . ▁ 1 ▁was ▁another ▁important ▁air base ▁in ▁Arizona ▁during ▁the ▁war . ▁Bu ilt ▁by ▁South west ▁Air ways ▁to ▁res emble ▁an ▁An as