In this reality, Charles Xavier became the Juggernaut who formed the X-Men. Thunderbird is a member of Charles Xavier's X-Men who serves as a police force that aids the mutants and persecutes the sapiens.
The total flight duration from Sydney, Australia to Boston, MA is 20 hours, 41 minutes. This assumes an average flight speed for a commercial airliner of 500 mph, which is equivalent to 805 km/h or 434 knots. It also adds an extra 30 minutes for take-off and landing. Your exact time may vary depending on wind speeds.
Check the Flight distance between Boston Logan International Airport and Downtown boston. Travel time is an important point to know with the driving distance. Hence you might also want to know the Travel Time from Boston Logan International Airport to Downtown boston. This will help you estimate how much time you will spend travelling for the distance from Boston Logan International Airport to Downtown boston.