At the beginning of the show, humans in 2035 live underground like mice, and the male protagonist is chosen to travel back to 1996 to obtain the original virus, so that he can come back and develop antibodies so that humans at that time can return to the surface of the earth. After the male protagonist successfully traveled to 1996, he also expressed his lingering in that era and his thirst for fresh air, and gradually did not want to return to the reality of 2035, so there were many volunteers who were not determined before, and went to Didn't come back after that. But the past is history is not reality, and it will not affect the status quo in 2035.
As read in other posts on the plane is a female scientist in 2035 (who traveled to get the original virus), she said that people in this era are too rude and violent to be hopeless and not worth saving. So they didn't think about changing history. (Because there is a logical problem, I won't talk about whether they have the ability to change.)
As for the airport, the male protagonist's friend Jose in 2035 came to rob him, not to stop Jeffrey, but to be like the male protagonist. As I said at the beginning, even if there are volunteers who are successful, they will not be treated well.
Although the film is set in 2035, there is no fantasy of the future, but a fear of the end. From Jeffrey's words, it is too cruel for people to experiment with monkeys. Violence and mania are viruses. If they cannot be suppressed, they will become the situation at the beginning of the movie.
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