NEW YORK CITY, New York: In another frustrating day for U.S. travelers, on the morning of August 9, 153 flights were canceled and more than 1,000 flights were delayed, according to flight-tracking website FlightAware.

However, these figures are still lower than the day before, when there were 7,000 flight delays and hundreds of cancellations.

FlightAware spokesperson Kathleen Bangs told FOX Business that while airlines are still affected by staffing issues, thunderstorms and other weather conditions, which were especially heavy over the weekend, caused more delays and cancellations.

FlightAware data showed that there were more than 30,000 delays and over 4,400 cancellations in the U.S. from August 4 through August 9.

Disruptions the airline industry faced over the weekend resulted from weather and air traffic control issues, a Delta Air Lines spokesperson told FOX Business.

Meanwhile, a spokesperson for Southwest Airlines said it was still working through "weather-related challenges."

However, Bangs stressed that cancellations were down compared with the first three months of the year, when staffing issues related to COVID-19 and winter storms hampered airlines' operations.

Earlier this summer, Nicholas Calio, president of the trade group Airlines for America, said its members improved training and only cut 15 percent of its scheduled flights through August, while also ramping up hiring.

However, ongoing problems have been intensified by rising demand, which are nearing pre-pandemic levels, forcing some carriers to reduce their fall schedules.

Last week, American Airlines announced that it is reducing its overall September capacity.