A 20 Satumba 1939, kafin YP-38s aka gina da kuma jirgin gwada, da USAAF umurni 66 farko samar P-38 hasken wuta, 30 daga wanda aka tsĩrar da USAAF a tsakiyar 1941, amma ba duk wadannan jirgin sama da aka dauke da makamai. The unarmed jirgin sama da aka daga baya sanye take da hudu.50 a (12.7 mm) bindigogi (maimakon biyu.50 a/12.7 mm da biyu.30 a/7.62 mm na magabata) da kuma 37 a (1.46 mm) cannon. Sun kuma da makamai gilashi, kokfit makamai da kuma fluorescent kokfit controls. Daya aka kammala tare da wani matsin lamba gida a kan wani gwaji akai da kuma mai suna XP-38A.
XP-38A