Multiple airlines disrupted due to Microsoft Azure outage

Frontier Airlines briefly grounded all flights due to a major outage in Microsoft networks affecting their booking and check-in systems. The issue, starting at 5:56 p.m., also impacted Allegiant Air and Sun Country Airlines. Microsoft's Azure system experienced problems, affecting customers in the central United States. The Federal Aviation Administration confirmed the ground stop, which was lifted after about 35 minutes. Frontier did not disclose the exact number of affected flights or passengers. Sun Country and Allegiant also reported disruptions in their services due to the global outage. Microsoft acknowledged the problem on its status page. Airlines issuing ground stops is a common practice during technical difficulties.