The most significant challenge facing Whitchurch–Stouffville in the coming years, however, is the federal government's proposed development of an international airport immediately south-east of Whitchurch–Stouffville (the Pickering Airport lands). Under the current plan, approaches for two of the three landing strips would be directly above Whitchurch–Stouffville communities: the first over Ballantrae, Musselman's Lake and the north-east corner of urban Stouffville, with planes descending (or ascending) from 535 to 365 metres (with an allowable building height in Stouffville of 43 metres); the second over Gormley and the Dickson Hill area (near the Walmart and Smart Centre). A "Needs Assessment Study" was completed by the Greater Toronto Airports Authority for the federal government in May 2010. After a "due diligence review," Transport Canada released the report in July 2011, which identified the most likely time range for the need of the airport to be 2027–2029, and confirmed the site layout proposed in the 2004 Draft Plan Report.