Abu Dhabi Aviation is the largest commercial helicopter operator in the Middle East, operating 61 helicopters (15 Augusta Westland AW139s, 23 Bell 412s, 19 Bell 212s and 4 Bell 206s), 3 fixed-wing aircraft (DHC-8). The company employs over 900 personnel, including over 150 pilots and over 150 aircraft maintenance engineers. The greater part of the company's business activity is in support of the Abu Dhabi offshore oil, engineering and construction industries. Other business activities also include medical evacuation, survey, photography and charter. Additionally, all aerial spraying of crops in the UAE and the majority of aerial spraying in Oman is carried out by ADA.