Airline executives said Thursday that the CDC had not contacted them about the possibility of expanding Covid-19 testing requirements to domestic flights.

“I’m not aware that the CDC has reached out to us, and by extension I’m not aware that they’ve reached out to the Airlines for America,” said Southwest CEO Gary Kelly, who is also the new chairman at Airlines for America.

“We certainly haven’t been informed that something’s imminent,” added American CEO Doug Parker.

The executives made their remarks during earnings calls.

On Tuesday, CDC director for global migration and quarantine Marty Cetron caused concern within the travel industry when he said that the Biden administration is “actively looking” at requiring testing for domestic air travel to go along with requirements that went into effect Tuesday for travelers returning to the U.S. from abroad.

On Wednesday, U.S. Travel’s executive vice president of public affairs and policy, Tori Emerson Barnes, said that the high cost and low availability of testing in parts of the U.S. “would make it quite unworkable.”

Airlines expressed similar views Thursday.

[W]hen you start thinking about a framework that’s already overburdened, and you add domestic travelers into that, this puts a ton of pressure on an already fragile system, and frankly, we’re concerned that it would actually reduce the ability of some people who legitimately need to get tested for health reasons to get tested,” JetBlue president Joanna Geraghty said during the company’s Thursday earnings call, according to a transcript posted by the investment website Seeking Alpha.

Kelly wondered aloud why air travel should be picked on specifically.

“If you want to test people, test them,” he said. “But test them before they go to the grocery store. Test them before they go to a restaurant. Test them before they go to a sporting event. I think it’s been well recognized that the air cabin is extremely clean and healthy and safe.”