Stacked PRs are a technique used to improve the efficiency and effectiveness of pull request reviews by breaking down large changes into smaller, more manageable pieces. This approach allows developers to construct a narrative with their code changes, making it easier for reviewers to understand the story behind each change. Stacked PRs work by creating a sequence of PRs, where each subsequent PR builds upon the previous one, allowing developers to start working on multiple parts of a feature simultaneously while the first PR is being reviewed and iterated upon. This approach enables faster development and reduces the emotional and practical costs associated with waiting for coworkers' approvals. Aviator, a tool that supports stacked PRs, automates tedious developer workflows by managing Git Pull Requests, continuous integration test runs, and merge processes to help teams avoid broken builds, streamline cumbersome merge processes, manage cross-PR dependencies, and handle flaky tests while maintaining security compliance.