my conclusion at the ending is something like this..
warning: if you haven't reach 150++ or completed reading this manga, please don't read the spoiler, cause i don't really like to spoil anything, manga means to be read and look..
the plane, 2307, should have been crash that exact coordinate and time and can be found later at the sea, with all the passengers, including ca, co/pilot, maybe, have died. all of that would happen if the Eden Project didn't exist.
Because they finished (or maybe half or 1/3 finished) the Eden Project, instead just crashing and all of them died, they get sent forward into the future. (100 or more years), so that they could get so that they could do 'some trial' whether or not they survive.
there is also a probability something like this..
all of the experiments with the extinct animal, is so that they could make their clone.. but i would like to deny it, cause at chapter 184 explain that the revival of extinct animal is her grandpa's wish
the ending is kind of sad, cause most of them won't be able to meet all of their family they left at japan,,(well there is 'Tragedy' tag for this manga), but absolutely not a cheap one, just kinda,, in a rush, but enough hints