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It depends on which way the wind is blowing. Aircraft always land and take off into the wind.
Mostly they do, not always. It is more efficient to take off into wind.
If it can be helped always land and take off into the wind (wind in your face)
Pilots always land and take off upwind (the wind is coming from straight ahead, or nearly so) Downwind is the opposite, when the wind is coming from behind. In order to tell, you can look up winds online (aviation weather dot gov) or look at the wind socket at the airport.
An anemometer is a device used to measure wind speed. Together with a weather vane, the airport can report the wind speed and direction to incoming planes to assist in preparing for landing. As planes almost always take off and land into the wind to improve lift at low ground speeds, the airport will typically specify the takeoff and landing direction to incoming planes and, if they have runways with more than one compass orientation, which set of runways to use.
Yes, airplanes always fly into the wind. It decreases the length required to takeoff because the net airspeed over the wings is higher. Logistically though, sometimes airports won't swap directions for a wind speed that's relatively small.
Wind strength or wind speed is important to a pilot because it effect the pilot's ability control the plane while in flight, upon take off, upon final approach and upon landing.
Wind.
Wind
If conditions (airport layout and traffic conditions) allow aircraft take off and land against the wind (headwind). This way the aircraft can take off or approach the runway at a lower ground speed.
It is difficult to ride a bicycle against the wind because of the pressure the wind puts out. If the wind is blowing against you, there is a resistance that makes it hard to go against.
They can, yes. It's a bit safer to land in the wind than landing with a tail-wind. A pilot can also land an airplane with a cross-wind.