London Gatwick Airport operates 24 hours a day, but it is subject to some of the world's strictest night flight restrictions to mitigate noise for surrounding communities. These regulations are defined by "Night Quota Periods," typically running from 11:30 PM to 6:00 AM. During this time, the airport is not "closed," but the number of landings and take-offs is severely restricted by a "quota count" system based on the noise level of individual aircraft. Quieter, modern planes (like the Airbus A320neo or Boeing 787) use up less of the quota, allowing them more flexibility to land late. However, noisier older aircraft are often prohibited from landing after 11:30 PM entirely. During the summer season, the total number of permitted night movements is higher than in the winter to accommodate holiday demand. If a flight is delayed due to "exceptional circumstances" like severe weather or air traffic control strikes, the airport may grant an emergency waiver to allow a landing after the quota has been met. For most commercial scheduled traffic, the majority of late arrivals wrap up by midnight, with a small number of permitted arrivals continuing through the early morning hours before the "morning rush" begins at 6:00 AM.