Websites of American Airlines, Southwest Airlines, United Airlines and Delta Air Lines face outage

More than a thousand user reports indicated problems at Southwest Airlines, with over 400 user reports indicating the same for Delta Air Lines, according to Downdetector.

FILE PHOTO: A United Airlines passenger jet takes off with New York City as a backdrop, at Newark Liberty International Airport, New Jersey, U.S. December 6, 2019. REUTERS/Chris Helgren/File Photo

Websites of major U.S. airline companies American Airlines, Southwest Airlines, United Airlines and Delta Air Lines faced an outage early on Thursday, according to outage monitoring website Downdetector.

More than a thousand user reports indicated problems at Southwest Airlines, with over 400 user reports indicating the same for Delta Air Lines, according to Downdetector. That number was around 300 for the other two airline companies.

User reports indicate United Airlines is having problems since 12:41 AM EDT. https://t.co/8kPlNv342o RT if you're also having problems #UnitedAirlinesdown

— Downdetector (@downdetector) June 17, 2021

User reports indicate American Airlines is having problems since 12:44 AM EDT. https://t.co/Yu1ZYomonG RT if you're also having problems #AmericanAirlinesdown

— Downdetector (@downdetector) June 17, 2021

Southwest canceled nearly 300 flights on Wednesday and delayed more than 500 a day after it was forced to temporarily halt operations over a computer glitch.