For the MD-88, an application for a type certificate model amendment was made after the earlier changes, so there was not a DC-9-88, which was certified on December 8, 1987.
Para o MD-88 a solicitude para a modificación da certificación realizouse tras os primeiros cambios, polo que nunca houbo un DC-9-88, só o MD-88, que foi certificado o 8 de decembro de 1987.