Siblings get on a plane and travel to a different dimension

[Lydia]

This is a children's scifi book. I bought it a while back at a Scholastic book fair around 2011-2016. It was a book about these siblings who get on a plane and I guess they travel to a different dimension or universe or something. Throughout the book they are racing against the clock (don't really know why,,,, I guess to get back to their own world?) I know for sure that one of them is a girl (i think she's oldest) and a boy and their may be a baby sibling but I'm not sure. On the cover its a picture of a plane and a stop watch or hour glass I can't remeber which one. I know during one part of the book they come to this neighborhood that looks exactly like their real neighborhood and they go to like their "dream" houses. I think there is also a part where the sister is in the sort of desert place. SPOILERS AHEAD!!! I'm pretty sure it ends with some lady finding them and it turns out they had been in a plane crash and the whole experience might have been a dream/hallucination.

[Kris]

No Passengers Beyond This Point by Gennifer Choldenko seems to match your description.

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