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The names of the affected airports - all high-traffic locations - will be released Thursday, the officials said. The cancellations could affect between 3,500 and 4,000 flights per day. " We are seeing pressures build in a way that we don't feel - if we allow it to go unchecked - will allow us to continue to tell the public that we operate the safest airline system in the world," Bedford said. Duffy said air travel is still safe, and the decision to cancel the flights was being made to maintain safety and efficiency. If the shutdown continues and adds more pressure to the system, additional restrictive measures may be required, Bedford said. Once government funds ran out on 1 October, most federal workers were sent home and told they would be paid once the government reopened. Those deemed essential, like controllers, though, had to keep doing their jobs without pay. Almost immediately after the shutdown started, airports began feeling the effects. Some had to ground flights for hours after air traffic controllers called out sick, while others relied on controllers from other airports. Duffy warned earlier this week that the flight cancellations may be coming, as half of the country's 30 major airports experience staff shortages. He previously said that there's a risk that comes with air traffic controllers taking on additional jobs during the shutdown, and had threatened to fire controllers who do not come to work. "They have to make a decision, do I go to work and not get a paycheque and not put food on the table? Or do I drive for Uber or DoorDash or wait tables?" Duffy said on ABC on Sunday.
