Up in the air

Photo of a hot air balloon
To be left up in the air means that something has not been decided yet or is still uncertain. Plans or outcomes that are up in the air may change because no final decision has been made.

The phrase comes from the image of something floating or hanging in the air without a clear place to land. Because it has not settled anywhere, it became a way to describe situations that are still unresolved.

Our travel plans are still up in the air.