The summer of air travel chaos continued with almost 900 flights cancelled and 6,500 delayed on Sunday

There were more than 800 flights that were canceled in the US on Sunday, according to data from flight tracking website, FlightAware.

Southwest Airlines canceled 105 flights, while American Airlines canceled 104 flights.

On the same day, over 6,700 US flights were delayed.

Travel disruptions have increased throughout the busy summer period as airlines have trimmed their flight schedules or canceled operations to cope with staff shortages.

Over the holidays, the situation has been disruptive. Over the Juneteenth and Father's Day weekend, tens of thousands of flights were canceled or delayed.

Demand for travel is returning to levels seen before the Pandemic as a result of the cancellation of flights.

Airlines are struggling to recruit and retain pilots because of the shortage caused by the Pandemic.

A shortage of air traffic controllers is one of the reasons for the disruptions. The airline reduced its schedule from Newark Airport in order to avoid delays.

Alaska Airlines and JetBlue have already slashed their summer schedules.

A travel analyst told Insider that bad weather and the upcoming hurricanes could make things worse.

Insider did not get a response from Delta, Southwest, and American Airlines.