Microsoft outage causes widespread airline disruptions and cancellations. Here's what to know.

Air travel is experiencing disruptions across the globe on Friday morning due to a Microsoft outage for customers of its 365 apps, including many major airlines. 

In the U.S., more than 1,000 flights had been canceled as of 8 a.m. Eastern Time, while more than 1,700 flights have been delayed, according to FlightAware, a flight tracking service.

Airlines said the outage impacted the back-end systems they use to send key data, such as weight and balance information, required for planes to depart.