Air traffic control staffing issues continued to cause major delays for passengers flying in and out of the busy Newark airport outside of New York City for an unprecedented sixth day in a row.

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.

United Airlines says it will cancel dozens of Newark flights per day after this week's delays and FAA staffing problems.