I-United Airlines imemezele namuhla ukuthi ilethe indiza yayo yokuqala engu-737 MAX 9 e-Boeing Delivery Center eSeattle, WA. Indiza entsha, efike ngemva koSuku Lomhlaba, inciphisa ukusetshenziswa kukaphethiloli kanye nokukhishwa kwe-CO2 ngokuphawulekayo uma kuqhathaniswa nezindiza zesizukulwane esidala. Ukuhlonipha le ndiza evumelana nemvelo kakhudlwana, i-United inikeze i-MAX i-livery entsha, efana nendiza yayo eyonga uphethiloli i-Boeing Dreamliner, ukuze abasebenzi namakhasimende bakwazi ukubona kalula indiza nokusebenza kwayo okusezingeni eliphezulu kukaphethiloli.
I-United ilindele ukuletha ezinye izindiza ezimbili ze-737 MAX 9 kule nyanga, futhi izoba nezindiza eziyi-10 737 MAX 9 ekupheleni kuka-2018. Njengoba kumenyezelwe ngaphambilini, indiza izongena ohlelweni lwe-United ngoJuni 7 ngesevisi phakathi kwehabhu lendiza e-Houston's George. Bush Intercontinental Airport kanye namadolobha amahlanu - Anchorage, Alaska; e-Austin, eTexas; Fort Lauderdale, FL; Orlando, FL. kanye neSan Diego. Indiza izosebenza emizileni eyengeziwe esuka e-Houston nase-Los Angeles International Airport kusukela mhla zingama-29 kuJuni.
