August 20, 2026
Night Flying Restrictions: Why Some Airports Close After Dark
Many airports impose curfews or night flying restrictions to protect surrounding communities from noise. Here is how these restrictions work and which major airports are affected.
Aircraft noise is one of the most significant environmental impacts of airports on surrounding communities. In response, many airports impose night flying restrictions — curfews or limits on the types of aircraft permitted to operate during nighttime hours. These restrictions can significantly affect airline scheduling and routing decisions.
Total curfews
Some airports impose a complete ban on aircraft movements during certain overnight hours. Sydney Kingsford Smith (SYD) operates under a curfew from 11 PM to 6 AM, which has long been a source of tension with airlines that want to schedule overnight arrivals and early departures. London Gatwick (LGW) and Heathrow (LHR) both have night flight restrictions, though the rules at Heathrow are particularly complex given its status as the UK's primary hub.
Noise quota systems
Rather than simple bans, many airports use noise quota systems that assign points to different aircraft types based on their noise profile. Airlines are allocated a total quota of points per season, incentivizing the use of quieter aircraft. This approach allows flexibility — an airline can fly a noisy aircraft at night, but it uses more quota points than a quiet one.
QC classifications
Heathrow's noise classification system assigns Quota Count (QC) values from QC0.5 to QC16 based on certified noise levels. Modern aircraft like the Boeing 787 and Airbus A350 achieve low QC ratings, while older aircraft types consume high quota rapidly — effectively pricing older jets out of night slot use.