A major upgrade is planned for Sydney Kingsford Smith Airport, including a new T4 International terminal, more gates added to existing terminals and multiple other accessibility enhancements. Terminal 4 will be located on the current Qantas maintenance jet base, adjacent to the existing Terminal 3 (Qantas Domestic). The plan was created due to the new threat Western Sydney (Badgerys Creek) Airport may pose to Sydney Airport once it is completed. Jetstar has already confirmed it will be switching to the new airport, Northrop Grumman will be building a base at the new airport, and the airport will be constructed and operated by the Australian Government after Sydney Airport Corporation cancelled plans to take ownership of the airport after completion.
More information on the upcoming airport: