state-of-the-art voice communications switch. NAV Canada shut down operations of the air traffic control tower on January 3, 2019. Future In September 2009, the Sifton family, owners of the airport, announced plans to re-develop the airport from 2009 to 2016 into a mixed use of commercial, retail and residential development. In the meantime the airport will continue to operate and unknown plans for the airport operations to re-locate to another GTA airport or cease operations altogether. On 28 October 2010, a press release announced that a joint real estate venture had purchased the 170-acre property on 7 October, which will be re-developed by Cadillac Fairview. Plans include condominiums, retail shops, and office space. Due to planning delays, in 2018 Cadillac Fairview announced the site will continue to operate as an airport until at least 2023. Buttonville Airport is privately owned, and is threatened with closure due to lack of funds. GTAA has stopped funding the airport causing a $1.5 million loss. GTAA blames the decrease of traffic at Pearson Airport for eliminating the subsidy. Transport Canada has not yet made a decision on the Pickering Airport project. Navigation There are three non-precision instrument approaches available: a Global Positioning System (GPS) approach to runway 33, a non-directional beacon (NDB) approach to runway 21, and a localizer approach to runway 15. Radio Buttonville Airport is in a Class E control zone. Aircraft must broadcast their intentions on the mandatory frequency 124.8 MHz prior to entering the control zone. Afterwards standard uncontrolled aerodrome position reports must be broadcast. The London Flight Information Centre has a Remote Communications Outlet at the airport operating on the frequency 123.15 MHz. Toronto Terminal handles instrument flight rules (IFR) arrivals and departures and Visual Flight Rules (VFR) flight following on 133.40 MHz. Flightline is available on 123.50 MHz. Navigation aids There are three ground-based navigation aids attached specifically to the Buttonville airport: a distance measuring equipment (DME) on channel 48 (111.1 MHz) with the identifier "IKZ", located on the airfield a localizer for runway 15 on the frequency 111.1 MHz Airport operating restrictions No practice circuits outside of YKZ Control Tower hours of operation No practice IFR approaches outside YKZ Control Tower hours of operation No practice Engine Failure on Take Off procedure (EFTO) in the YKZ Positive Control Zone No touch and go circuits by excessively noisy aircraft It has been agreed with the airport and the