One advantage of availability zones includes:

The advantage of availability zones being that resources across availability zones can survive a data center outage highlights the design of cloud infrastructure to enhance fault tolerance and reliability. Each availability zone typically operates in a physically separate data center within a region. By distributing resources across these zones, a cloud provider ensures that if one AZ faces an issue, such as hardware failure or maintenance downtime, the resources in the other AZs remain unaffected.

This capability is crucial for maintaining uptime and continuity of services because it allows applications and services to be designed in a way that they can failover to another AZ without significant disruption. This is especially important for businesses that rely heavily on cloud services for their operations, as it provides a robust mechanism to handle hardware or service interruptions that are isolated to a specific data center.

While resources being resilient to regional or global outages is also important, this specific question is focused on the survivability aspect within the scope of a single region, where data center or availability zone configuration plays a key role.