Is your plan still up in the air?

All up in the air

The meaning is –Something is uncertain or undecided; the outcome is not yet clear.

Similar idioms –

• In limbo

• Hanging in the balance

Examples

1. Our travel plans are still all up in the air because of the weather forecast.

2. The future of the project is up in the air until we get more funding.

中文意思是 – 尚未決定、未定之數 / 尚未决定、未定之数