The Airport Environmental Consultative Committee requested an investigation into concerns that some airlines were not performing the required turn correctly after departure from Runway 15. Aircraft are required to begin their turns at the earlier of the end of the runway or when they reach 400 feet. Non-compliance is followed up by air traffic control.

Data on 4178 jet departures from July to November 2016 was analysed. The investigation found that variations in the turns were not confined to any one airline, and were the result of the differing turn performance of different aircraft types. While aircraft were beginning their turns at the correct point in flight, some aircraft types would take longer to complete the turn than others, creating a wider arc.