Ethan Rucinski stabilized the test infrastructure for Airflow 3 in the aws/amazon-mwaa-docker-images repository by implementing a compatibility fix that conditionally resolves remote task log group ARNs and the execution API server URL based on their presence in the configuration. Using Python scripting and configuration management skills, he prevented unconditional processing of environment variables during test setup, which reduced CI flakiness and improved reliability for Airflow 3 validation. This targeted bug fix enabled test scripts to run consistently across environments, supporting smoother adoption of new Airflow 3 images and accelerating downstream validation workflows for DevOps and continuous integration processes.