Irokethi yomanyano lweAtlas V enomjukujelwa kunye neBoeings CST-100 Starliner yesiphekepheke ebhodini emi kwindawo yokuphehlelela eKapa eKapa isiKhululo soMkhosi woMoya eFlorida phambi kovavanyo ngoDisemba 2019.UJoel Kowsky / NASA ngokusebenzisa imifanekiso kaGetty Ngo-Novemba ophelileyo, i-SpaceX iphumelele ukuthumela oosomajukujuku abane kwiSitishi saMazwe ngaMazwe sokuSebenza kwindawo yokuqala yokusebenza yeCrew Dragon, phantsi kwenkqubo ye-NASA ejolise ekuthutheni rhoqo oosomajukujuku kunye nokuhlawulwa kwemirhumo kwi-ISS kunye nokuphelisa ukuthembela okuphela kwearhente kwiirokethi zaseRussia kubuchwephesha babantu ukususela ngo-2011.
Kudliwanondlebe kule veki, intloko ye-NASA ye-spaceflight yomntu ithe i-SpaceX capsule, egama linguResilience, yenza kakuhle njengokwandiswa kwesikhululo sendawo kwaye i-NASA yonwabile kakhulu yindlela izinto ezihamba ngayo ukuza kuthi ga ngoku. I-SpaceX kulindeleke ukuba ibhabhe nomsebenzi wayo olandelayo we-ISS, i-Crew-2, ngo-Epreli 20, isebenzisa kwaleyo Crew Dragon yesiphekepheke eyabhabha oosomajukujuku ababini beNASA kuvavanyo lwedemo ngoMeyi 2020.
Kwakhona ngo-Epreli, iBoeing iya kuvavanya ukubhabha i-CST-100 Starliner capsule engavulelwanga, isiphekepheke esenzelwe ukubhabha i-ISS mission enye, eHouston.
Zombini i-Boeing kunye ne-SpaceX ziikhontrakthi eziphantsi kwenkqubo ye-NASA yezoRhwebo, umzamo wexesha elide wokuhlaziya inkqubo ye-arhente yokuthatha indawo ethathe umhlala-phantsi kunye nokwandisa ubungakanani babasebenzi kwi-ISS. I-NASA yagunyazisa ezi nkampani zimbini ngo-2014 nganye ukuba yakhe inkqubo yerocket-spacecraft esebenza kwakhona yokuhambisa oosomajukujuku kunye nemithwalo yokuhlawula kwisikhululo sasemajukujukwini. I-SpaceX icwangcise ukusebenzisa i-Falcon 9 booster kunye ne-capsule entsha ebizwa ngokuba yi-Dragon 2, ngelixa i-Boeing icwangcise ukumilisela eyayo i-spacecraft kwi-United Launch Alliance Atlas V rocket.
Ngaphandle kwendalo efanayo yezabelo zabo, ikhontrakthi ka-Boeing kunjalo phantse iphindwe kabini kunexabiso njengoSpaceX. I-NASA ivumile ukuhlawula i-SpaceX $ 2.5 yezigidigidi ngesiphekepheke kunye nohambo olwenziweyo lokuya kwi-ISS. Iarhente izibophelele ekuhlawuleni iBoeing $ 4.3 yezigidigidi ngenxa yemishini efanayo kwaye kamva yongeze i-300 yezigidi zeedola kwisivumelwano, a Uphicotho-zincwadi luka-2019 lubonakalisiwe, ukugubungela indleko ze-Boeing kwisithuba seenyanga ezili-18 esiphakathi kwe-Starliner yesibini kunye neyesithathu. 
I-Boeing CST-100 Starliner spacecraftcraft ibonwa emva kokuba ifike eWhite Sands, eNew Mexico, ngeCawa, nge-22 kaDisemba ngo-2019.IBill Ingalls / NASA ngokusebenzisa imifanekiso kaGetty
Zombini iinkampani zaphela zisale emva kweshedyuli yokuqala ababezithembisile. Kodwa i-SpaceX ihambise iprojekthi ngaphambi kwexesha kuneBoing. I-Crew Dragon spacecraftcraft yabhengezwa njengempumelelo emva kokuba ibhabhe oosomajukujuku ababini be-NASA, uBob Behnken noDoug Hurley, baya kwi-ISS kuvavanyo lokugqibela ngoMeyi ophelileyo. Ngokwahlukileyo, i-Starliner ka-Boeing isasokola ukuphakamisa uvavanyo lwayo lokuqala olungafakwanga emhlabeni.
NgoDisemba ngo-2019, i-Starliner engafakwanga isilele ukufikelela kwi-ISS kwaye yabuyela eMhlabeni kuhambo olufutshane lovavanyo. U-Boeing uchithe ngaphezulu konyaka ukusukela ngoko ukulungisa i-software kunye nokujongana nezinye iingxaki zobuchwephesha eziphakanyiswe yi-NASA. U-Boeing uthethe iipesenti ezingama-95 zezindululo ezenziwe liqela leenkampani ezivavanya uvavanyo lwenqwelomoya ngokusekwe kwindiza engaphumelelanga ye-2019, utshilo uNASA kuhlaziyo ngoFebruwari 17.
Isilingo sayo sesibini, esingacwangciswanga ngaphambi komhla we-2 ku-Epreli, sasicwangciselwe ekuqaleni kuka-Matshi kodwa kwakufuneka silibazisekile ngenxa yokuphela kombane eTexas kwiveki ephelileyo.
Ngeemvavanyo ezisesikweni ezigqityiweyo, iBoeing iyaqhubeka nokulungiselela ukubhabha, utshilo uBoeing kwingxelo kwiveki ephelileyo. Siyaqhubeka nokuqinisekisa ukhuseleko lwemveliso yesiphekepheke sethu kwaye sijongana nayo nayiphi na imiba evelayo kwangexesha.
