We're not entirely sure how many American Airlines, Inc. flight delays or cancellations on Sunday are due to labor shortages, but Twitter has erupted with furious customers across the US who blame entire crews for not showing up and resulting in travel disruptions. 

From Las Vegas to Miami to Charlotte and many other airports, passengers are fed up with the airline carrier. They're venting their frustration on Twitter this afternoon. 

Twitter user Ryan Petrosso spoke of canceled flights at Las Vegas Airport. He shows a video of understaffed representatives. 

@AmericanAir 2 cancelled flights from #LAS, we've been in this line for over an hour and only 2 reps to help. After we were on hold for 2 hours via phone. This is the worst service. pic.twitter.com/yowCLWqLhX

— Ryan Petrosso (@rpetrosso) August 15, 2021

People are complaining entire airplane crews aren't showing up as the labor shortage deepens. Many people are stranded at airports and will likely either get hotel vouchers tonight or have to sleep in the airport.