Delays are being reported nationwide as the government shutdown continues.

According to Flight Aware, 240 flight cancellations were reported nationwide. The delays are being linked to an uptick in sick calls among air traffic controllers, who are required to work even though they are not getting paid. 

The FAA says that delays are expected as the number of air controllers shrink. 

A handful of those delays were also reported at the San Jose Mineta International Airport. 

Joan Bremer and her son were some of the travelers that ran into them Tuesday. 

“Our flight was already delayed 30 minutes, I hope that’s it,” Bremer said. 

The San Jose Mineta International Airport says they have not seen a significant jump in delays yet, but fliers in the area wonder if that’s about to change, especially after a draft of a White House memo leaked which suggested some furloughed federal workers may not receive back pay when the government reopens. 

“For the most part, we’re going to take care of our people. There are some people who don’t deserve to be taken care of and we will take care of them in a different way,” President Donald Trump said in the memo.

The National Air Traffic Controllers Association Union sent a warning on the website for those air traffic controllers calling in sick, which reads, “Members who participate in a job action could be removed from federal service.” The warning tells members “it’s more important than ever that we rise to the occasion.”

“If we have additional sick calls, we will reduce flow in a rate that’s safe for the American people,” said Sean Duffy, US Transportation Secretary. 

There are 13,000 air controllers nationwide, but the training of new controllers has come to a halt because of the federal shutdown.