United Airlines has blamed some of the issues on airport construction among other factors.
Flight attendants in Newark join nationwide protest of problems they say delay flights
United Airlines will cut 12% of Newark flights in effort to tame delays
Brazilian-American Chamber of Commerce
Why United Is Cutting 50 Domestic Flights per Day at Newark - AFAR
United pilots reject contract deal that 'fell short
Brazilian-American Chamber of Commerce
Airport Archives - Page 2 of 7 - Airplane Geeks Podcast
United Airlines to Trim Flight Schedule at Newark Airport
Spirit Airlines Now Adding Flights From Atlantic City Airport