The girl that was shown on the plane at the end is the same girl from Ep1
also, the same girl that would always show up to vivy's performances. When Matsumoto shared all the future events with vivy near the end, vivy saw that her friend would die in the accident, so she tried to save her this ultimately
leads up to the final minutes of the episode. Where Matsumoto reminds her
to stay focused on the mission. Ep 3 and 4 go crazy so I can't wait.