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.
Account of a London to Boston voyage = 3,280 miles / 50 days transit time. Comments in Ben Franklin's biography regarding a bet on the speed of the packet Lutwidge = 14.95 miles / hour. Account of the sailing vessel Red Jacketâs voyage from New York to Liverpool = 3,473 miles / 13 days transit time.