Xitaa haddii ay dhacdo, USAAC ayaa la yaabay waxqabadka nooca, iyo 17 January 1936, iyada oo loo marayo loophole sharci ah, Ciidanka Cirka ayaa amar ku bixiyay 13 YB-17s (oo loo magacaabay Y1B-17 ka dib November 1936 si loo muujiyo maalgelinteeda gaarka ah ee F-1) si loo tijaabiyo adeegga. YB-17 waxay ku dartay tiro isbeddello muhiim ah oo ka yimid Nooca 299, oo ay ku jiraan matoorrada awoodda badan ee Wright R-1820-39 Cyclone. In kasta oo nooca nooca nooca loo yaqaan 'B-17' uusan waligiis helin taxane milatari (magaca B-17 laftiisu si rasmi ah uma soo muuqan ilaa Janaayo 1936, ku dhawaad saddex bilood ka dib markii nooca nooca hore uu burburay), ereyga "XB-17" ayaa dib loogu dabaqay qaabkii NX13372 wuxuuna galay ereyga si loogu tilmaamo qalcaddii ugu horreysay ee duusha. Su'aal: Sidee ayey u suurtagashay Ciidanka Cirka inay dalbadaan 13 YB-17s?
meel bannaan oo sharci ah