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Present day auto-land systems are capable of landing an aircraft in zero/zero conditions. (That's zero ceiling and zero visibility.) However, most operators of US carriers rarely go to the expense of the additional training required to qualify crews to these minimums as zero/zero conditions are seldom encountered. Most only train crews down to minimums of 300' or 600' RVR. (Runway Visual Range is a specialized instrument measurement of lateral visibility as viewed along various portions of the runway.) Answer The aviation industry is developing a HUD (Head's Up Display) that will project Infra-Red imaging in front of the pilot that will greatly enhance his "vision" for adverse landing conditions, whether it is darkness, fog, etc. The cost of operating auto-land systems also includes equipment for the aircraft. So if an operator has a fleet of aircraft, this would require the operator to upgrade his fleet and train all of his crew so they could fly any aircraft in any condition as needed.

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Q: How much visibility is needed to land a plane?
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