United Airlines, Delta Air Lines and American Airlines are waiving both the change fee and fare difference for international travelers seeking to return to the US immediately. The moves are in response to a new rule going into effect on Jan. 26 from the Centers for Disease Control and Prevention requiring that all international travelers to the US, including citizens, show proof of a negative COVID-19 test taken within three days of departure. All three carriers have issued a temporary fare difference waiver for travel from all international destinations to the US. For tickets purchased on or before Jan. 12 with travel through Feb. 9, American and Delta will allow flyers to change to any other flight before the new testing requirement kicks in. Under United’s policy, the carrier’s waiver includes international tickets originally purchased on or before Jan. 12, 2021, for scheduled travel to the US through Feb. 15.  The industry had already reacted to the new CDC rules. In a statement, Tori Emerson Barnes,  U.S. Travel Association executive vice president of public affairs and policy, said that a testing requirement should be met with the removal of travel restrictions and quarantine mandates. She said that with an international testing requirement in place, international visitors and returning residents would be tested at much higher rates than the general public and pose a much lower risk of transmitting the disease. “So it would make sense,” she said, “to lift international travel restrictions and quarantine requirements at the same time.”