The literal expression "wheels up" refers to the exact moment an airplane departs from the ground, lifting its landing gear as it ascends into the sky. Beyond its aviation definition, the phrase is widely adopted in professional, military, and corporate logistics to signify that an operation, project, or journey has officially commenced and is underway. When a team or executive group states that it is "wheels up," it communicates active deployment, immediate departure, or that a mission has passed the planning stage and is actively moving forward without delay.