Leaders of several major U.S. airlines met online Friday with White House officials to press their case against requiring coronavirus tests for passengers on domestic flights, saying it would undermine the already fragile industry.

White House press secretary Jen Psaki downplayed speculation that the Biden administration could soon impose a requirement that passengers on domestic flights first pass a COVID-19 test. But she stopped short of taking the idea off the table. A person familiar with the discussions said the airline CEOs talked with White House coronavirus-response coordinator Jeff Zients, according to the person, who spoke anonymously to discuss a private meeting.

The CEOs of American, United, Southwest, Alaska and JetBlue all took part in the meeting, according to industry officials. The meeting was arranged after Transportation Secretary Pete Buttigieg and Rochelle Walensky, director of the Centres for Disease Control and Prevention, said that a testing requirement before domestic flights was under consideration.

Since late January, the CDC has required that international travellers show a negative COVID-19 test or recovery from the virus before they board a flight to the U.S. The airline industry generally supports that rule, believing that testing could eventually replace tougher international travel restrictions, such as quarantines.

Airlines reacted with alarm, however, when CDC officials raised the possibility of testing larger numbers of passengers on domestic flights. Airlines officials say that would further devastate air travel, which has still not returned even to half its pre-pandemic level. They worry that the additional cost of a test would discourage people from taking shorter trips.

The airlines also argue that there isn’t enough testing capacity to test every passenger. More than 1 million people went through checkpoints at U.S. airports in one recent day, according to figures from the Transportation Security Administration. They also say that requiring people to take a coronavirus test before flights would cause more people to drive — merely shifting the risk of spreading the virus from planes to cars.

Airline unions have joined the push against testing domestic passengers. The Southwest Airlines pilots’ union said a testing mandate “would decimate domestic air travel demand, put aviation jobs at risk, and create serious unintended consequences.”