Flight delays and cancellations continued to mar thousands of Fourth of July travelers on Friday, with United Airlines passengers bearing the brunt of the problems. United Airlines has fared the worst with disruptions, with half of its mainline flights arriving late during that six-day period amounting to average delays of 106 minutes, according to FlightAware data. Transportation Secretary Pete Buttigieg called United out for the flight disruptions, saying the airline's disruptions were "elevated but moving in the right direction." United said late Thursday that it expected cancellations and delays to continue to improve into the holiday weekend. "It led to massive delays, cancellations, diversions, as well as crews and aircraft out of position," Kirby wrote in a staff note, which was seen by CNBC.

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Persons: Pete Buttigieg, United, schedulers, Ken Diaz, Garth Thompson, Scott Kirby, Monday, Kirby, Joanna Geraghty Organizations: JFK International, Airlines, Transportation Security Administration, Federal Aviation, United Airlines, O'Hare, U.S, JetBlue Airways, Transportation, Association of Flight, Air Line Pilots Association, United, FAA, Newark Liberty International, New, CNBC, JetBlue Locations: New York City, Canada, East, Chicago , Illinois, U.S, New York, United, New Jersey