At what wind speed do they cancel flights?

Most airlines operate under the rule that no flights will operate if the winds are greater than a certain speed, typically between 30-45 knots (approximately 33-52 mph). This speed can vary depending on the size and weight of an aircraft, as well as the type of runway and approach procedures used. In some cases, flights may also be cancelled due to sustained strong crosswinds and/or gusts.
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