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.

United is Newark Airport‘s largest carrier. Cutting 35 flights means slashing about 10% of its daily agenda at the airport, where the airline flies an average of 328 flights a day. A spokesperson for the Port Authority of New York and New Jersey, which manages New Jersey’s airports, did not immediately respond to a request for comment.