Over the last 20 years, the aviation industry has seen substantial improvements in aircraft design, engine technology and operational procedures.
The following map shows how our noise contours (57dB Leq day standard) have varied over the last 20 years. Over that same period, the number of aircraft movements have also changed as follows:
| Year | Contour Area 57dB LEQ (sq km) | Population in contour | Aircraft movement |
| 2005 | 49.3 | 4,800 | 261,241 |
| 2015 | 42.8 | 3,650 | 267,777 |
| 2025 | 31.3 | 1,900 | 263,049 |
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