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__NOTOC__ A landing slot, takeoff slot, or airport slot is a right granted by an airport owner which allows the slot holder to schedule a landing or departure during a specific time period. Landing slots are allocated in accordance with guidelines set down by the IATA's Worldwide Airport Slots Group. All airports worldwide are categorized as either Level 1 (Non-Coordinated Airport), Level 2 (Schedules Facilitated Airport), or Level 3 (Coordinated Airport). Allocated landing slots may have a commercial value and can be traded between airlines. Continental Airlines paid $209 million for four pairs of landing slots from GB Airways at London Heathrow Airport. If an airline doesn't use an allocation of slots (typically 80% usage over six months) then it can lose the rights. Airlines may operate ''ghost'' or empty flights to preserve slot allocations.〔(Green anger at 'ghost flights' )〕 ==Level 3 Coordinated Airports== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Landing slot」の詳細全文を読む スポンサード リンク
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