Up in the Air: Origin and Meaning
A clear picture, that the thing mentioned is floating around, and not fixed in place, or certain. The phrase has been used since the 1700s, although people originally said just “in the air”.
– “We thought the deal would go ahead, but their CEO left, and now everything’s up in the air”
– “No, I haven’t booked the holiday yet- it’s still up in the air”