There’s nothing more frustrating for travelers than getting a notice that their flight has been canceled, especially when it isn’t even true.

Due to an upcoming strike, British Airways has reportedly been forced to cancel flights on several dates in September. According to reports, customers with flights scheduled for non-strike days incorrectly received messages saying that their flights had been canceled.

British Airways apologized and blamed the issue on an “email error,” The Guardian reports. The British Airline Pilots Association will reportedly strike on September 9, 10 and 27, which will cause a large number of cancellations and delays.

In a statement obtained by The Guardian, a spokesperson for British Airways confirmed that a number of customers had received cancellation notices for flights scheduled on “non-strike days.” These emails were apparently sent in error, and the company says that they are contacting these travelers to confirm that their flights are still scheduled.

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The Guardian also reports that the statement says that some flights on non-strike days could also be affected.

A spokesperson for British Airways confirmed to Fox News that "some people received an email in error." They continued to say, "We are sorry that some customers received an email in error to say that their flight had been canceled on non-strike days. We emailed all those customers within a few hours to clarify that their flight will go ahead as planned."

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They continued to say that customers that booked alternative flights after receiving the email will be reimbursed.

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The strike is reportedly in response to negotiations over a new pay deal. On Twitter, British Airways referred to the union's actions as an “unjustifiable strike action.”