Neal battled Bastion and the Prime Sentinels, but would have been overcome if his brother, fighting the Sentinel programming, had not saved him. Sanjit sacrificed himself so Neal and Karima could escape. However, Karima was beginning to succumb to the Sentinel programming, becoming an Omega Sentinel.
If you include this extra time on the tarmac, the average total elapsed time from gate to gate flying from Los Angeles, CA to Atlanta, GA is 4 hours, 14 minutes.
While Australia is a fair distance away, the flight is not nearly as daunting as you may think. The flight from Los Angeles to Sydney is around 14 hours, and the flight from Los Angeles to Melbourne is around 15 hours. When travelling to Australia from the United States, Los Angeles and San Francisco are your only 2 departure options.