The cause of the crash was independently investigated by two agencies in two countries: the United States National Transportation Safety Board (NTSB) and the Indonesian National Transportation Safety Committee (NTSC).
A causa do accidente foi investigada independentemente por dúas axencias en dous países: nos Estados Unidos pola Xunta Nacional de Seguridade no Transporte (NTSB), e en Indonesia polo Comité Nacional de Seguridade no Transporte (NTSC).