“What other jumbo jet can fly from Sydney, AU to Dallas, TX?”
the 777 flies Los Angeles to Sydney daily. My Sis is a Flight attendant for Delta and has made that trip once a week for the last three years. That trip is 7500 miles which isnt as far as Dallas which is 8500 miles, but the 777 can stretch it to 9500 Miles.
Looks like even the 747 doesn't do that flight, only the Quantas A380 is running that route. He longest current commercial flight right now is Auckland to Dubai running a Triple 7 8800 miles.