The noise you hear at any particular time is largely determined by the direction that aircraft flies as they arrive at or depart from the Airport runways. Aircraft operations late at night and early in the morning generally take place over areas
North or South of the Airport. However, several factors may alter the normal pattern, such as wind speed, direction, weather conditions and pilot or Air Traffic Controller choice.
The need to close runways or taxiways for maintenance and repairs may also change flight operations, resulting in flight patterns that residents are not accustomed to.
You may hear unaccustomed noise on certain days due to wind and other weather conditions, such as cloud cover and temperature inversions, that influence the way that sound travels.
In addition to these factors, there is an obvious difference in the volume of noise generated by different aircraft.
Because of these variables, the noise that you hear can vary from day to day and during the course of a day.