For the fourth consecutive year, the Airport Authority (AA) extended their green spirit by taking on the "Tree Planting Challenge 2014" organised by Friends of the Earth on 27 April 2014. The AA fielded two teams to Ma On Shan Country Park on the day in full support of the event's cause of educating the general public to treasure Hong Kong's countryside and promoting awareness on environmental conservation. The unique challenge combines the activities of tree planting and hiking. Each AA team was required to plant 30 seedlings throughout a 4 kilometre hiking course within a designated time.