[up in the air] {adj.}
or {adv. phr.}
1. {informal} In great anger or excitement.
* /My father went straight up in the air when he heard I damaged the car./* /The Jones family are all up in the air because they are taking a trip around the world./
Compare: HIT THE CEILING, BLOW A FUSE. 2. also [in midair] Not settled; uncertain; undecided.
* /Plans for the next meeting have been left up in the air until Jane gets better./* /The result of the game was left hanging in midair because it rained before the finish./
Compare: LEAVE HANGING.