Qantas ROP demonstrates a sophisticated multi-region GCP architecture spanning australia-southeast1 and australia-southeast2, integrating AWS workloads, SaaS vendors, and AI agents through private connectivity. Data flows from Apigee X API gateway through Cloud Run microservices (Saga Logic, Canonical Transform, MCP Server) into Cloud Firestore, Cloud Spanner, and BigQuery, with event-driven async processing via Cloud Pub/Sub and observability via Cloud Trace, Datadog, and Splunk. The design enforces zero-trust security using VPC Service Controls, Binary Authorization, Cloud KMS CMEK encryption, Workload Identity, and Service Mesh mTLS across all regions. This architecture solves multi-cloud governance, compliance, and real-time transaction processing for large-scale airline operations. Fork this diagram on Diagrams.so to customize region placement, add additional vendors, or adapt the Saga pattern for your domain-driven design. The use of Cloud Spanner for distributed transactions and Memorystore Redis for session state exemplifies handling high-concurrency, low-latency requirements across geographies.