United Airlines, which has a hub at Newark, announced on May 2 that it would cancel 35 daily round-trip flights—representing about 10 percent of the flights operated by United out of EWR—due to the delays in order to protect their customers.

Hundreds of flights were canceled or delayed at Newark Liberty International Airport over the weekend and again on Monday as shortages of air traffic controllers persists, causing flight disruptions at one of the nation’s busiest airports.