If winds are blowing 10 knots or above, in which direction must aircraft land?

In aviation, when aircraft are landing, the primary consideration is safety and control during the landing phase. A headwind is the most advantageous wind condition, as it provides lift and allows for a shorter landing roll. This means the aircraft can touch down more easily and slow down more quickly, which is crucial for safety.

Landing with a tailwind can increase the landing distance required, jeopardizing the aircraft's ability to stop before the runway ends. Crosswinds present challenges in control during landing but may still be manageable depending on the strength and direction of the winds.

Thus, landing only into a headwind is the recommended and safest approach when wind speeds are at 10 knots or above, as it optimally supports the aircraft's performance and safety.