 In the late 1970s, Deerfoot Trail was extended further south, resulting in the direct connection to Blackfoot Trail being removed in favour of using 17 Avenue SE, and Barlow Trail being realigned as part of the construction of the Peigan Trail interchange.As part of the construction, direct movement to 26 Avenue SE was removed in favour of the southern section of Barlow Trail accessing Deerfoot Trail, and subsequent traffic calming removed direct access south of 17 Avenue SE.In the 1980s, the city of Calgary annexed land north of the airport, resulting in the Highway 2A designation being removed.