Australia's largest airline, Qantas, says it will offer refunds or alternate destinations to any passengers that are blocked from entering the United States.
Qantas will offer refunds to any passengers caught up in US President Donald Trump's immigration freeze on seven Muslim-majority nations.
The airline said on Sunday it will change its processes and booking systems following advice from the US government regarding tighter entry conditions.
"Passengers booked on Qantas for travel to the United States who use a passport from Iran, Iraq, Sudan, Somalia, Syria, Yemen, Libya have a number of options, including a change to their destination or a refund," Qantas said in a statement.
Mr Trump has signed as executive order stopping immigration from seven Muslim-majority nations and placed a temporary suspension on refugees.