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Jetstar Airways confirmed its involvement in discussions with Melbourne Airport regarding the expansion of terminal facilities to accommodate for the growth of domestic low-cost services. The expansion of Terminal 4 includes infrastructure to accommodate Tiger Airways Australia and Jetstar Airways flights. The development cost hundreds of millions of dollars. In March 2012, airport officials T4 would break ground that October the same year T4 and they expected completion in July 2014, however they later pushed that date to late August 2015. The facility opened on 18 August 2015. The new T4 terminal is and linked "under one roof" with T3. Terminal 4 is currently used by Regional Express Airlines, Jetstar Australia, Airnorth and formally Tigerair Australia. In November 2015 Jetstar moved into T4. Three Gates are dedicated to Virgin Australia. Jetstar has triple the number of gates it had at T1.