Sydney Airport will embark on its largest terminal expansion since the city hosted the Olympics 25 years ago by building up to 14 new gates for aircraft, in a bid to ready itself for competition from Western Sydney Airport late next year.

A draft master plan for Kingsford-Smith released on Monday also confirms changes to flight paths to make room for planes using the curfew-free Western Sydney Airport from late 2026.

The flight paths most affected will be those used by aircraft taking off to the north from Sydney Airport’s main north-south runway before arcing towards the north-west over inner west suburbs such as Summer Hill, Ashfield and Croydon. The other change is to aircraft heading west from the east-west runway.

In a shot across the bow of its fledging rival, Sydney Airport’s e

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