Examples:

• Contract with the city is up in the air.
• I want planes up in the air morning and afternoon.
• He was three miles and a half up in the air.
• Well, you and me We're still up in the air.
• I'm so tired of having my legs up in the air.
• Well, we got a bunch of stuff up in the air.
• I told you my future was up in the air.
• No, it doesn't work unless it's up in the air.