The best rationalization is that the inclusion of Travis may need been just a little awkward, from a story standpoint. If Travis was included within the hallucination, would he be the grownup Travis who died at first of the sequence, or the teenage Travis? From Natalie’s perspective, grownup Travis makes essentially the most sense. Natalie had an ongoing relationship with Travis after the rescue (one thing she did not have with Lottie), and it is grownup Travis’ state of affairs that worries her essentially the most. The issue is, viewers by no means actually cared about grownup Travis, to the purpose that it most likely would have taken us a second or two to even acknowledge him.
If the sequence had determined to incorporate Travis within the airplane hallucination, it will most probably be teenage Travis. Would which have labored? Possibly, however that will have taken the main focus away from Javi and Lottie, the characters Natalie’s story has revolved round essentially the most within the final two episodes. There’s additionally the issue that Travis is not all the time a comforting determine to Natalie. Javi was all the time good to her and Lottie all the time tried to be supportive, however Travis went via a number of intervals of sullen and withdrawn conduct. There are three extra seasons and many extra heartbreak to come back, so possibly Travis and Natalie’s relationship takes even darker turns from right here.
Most essential, nonetheless, is that with Javi’s loss of life in each timelines, his relationship with Natalie is over. In the meantime, Travis and Natalie are nonetheless an important a part of the teenage timeline, a storyline the writers nonetheless need us to care about going ahead. It’d make sense for grownup Natalie to say goodbye to Travis in his last moments, however for the present itself, it will be a untimely farewell. The fates of the 2 could also be sealed, however their tales are nonetheless removed from over.