6,500 US Flights Delayed Sunday Amid Continued Travel Chaos Ahead Of Fourth Of July Weekend 6,500 US Flights Delayed Sunday Amid Continued Travel Chaos Ahead Of Fourth Of July Weekend While airlines and the Federal Aviation Administration (FAA) blame each other for soaring flight delays and cancellations that have made traveling across the country a living nightmare, flight disruptions show no signs of abating as the situation worsens ahead of the July Fourth holiday weekend when travel demand will increase. On Sunday, 6,700 flights were delayed, and nearly 900 were canceled across the US, according to data from FlightAware . Flight disruptions were particularly disruptive over the Juneteenth and Father''s Day weekend when tens of thousands of flights were delayed or canceled -- forcing many to sleep in airports for more than 24 hours . On Friday, airline industry group Airlines for America, which represents the country''s largest airlines (American Airlines, Delta, United, Southwest, JetBlue and Alaska Airlines as well as shippers FedEx and UPS), blamed the FAA''s own understaffing is "crippling" East Coast air traffic.