air alert

Noun
  1. The time period during which military and civilian agencies are prepared for an enemy air attack (synset 115323102)
    is a type of: period, period of time, time period - an amount of time
  2. The condition in which combat aircraft are airborne and ready for an operation (synset 114055404)
    "aircraft in the Mideast are on air alert"
    is a type of: alert, qui vive - condition of heightened watchfulness or preparation for action
  3. The warning signal that begins a period of preparation for an enemy air attack (synset 106815881)
    is a type of: alarm, alarum, alert, warning signal - an automatic signal (usually a sound) warning of danger

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