diff --git a/airflow/dags/cwl_dag.py b/airflow/dags/cwl_dag.py
index 44a2246b..737b0d27 100644
--- a/airflow/dags/cwl_dag.py
+++ b/airflow/dags/cwl_dag.py
@@ -25,7 +25,8 @@
 # The Kubernetes namespace within which the Pod is run (it must already exist)
 POD_NAMESPACE = "sps"
 POD_LABEL = "cwl_task"
-SPS_DOCKER_CWL_IMAGE = "ghcr.io/unity-sds/unity-sps/sps-docker-cwl:2.2.0-beta-1"
+# SPS_DOCKER_CWL_IMAGE = "ghcr.io/unity-sds/unity-sps/sps-docker-cwl:2.1.0"
+SPS_DOCKER_CWL_IMAGE = "ghcr.io/unity-sds/unity-sps/sps-docker-cwl:2.2.0-beta-3"
 
 NODE_POOL_DEFAULT = "airflow-kubernetes-pod-operator"
 NODE_POOL_HIGH_WORKLOAD = "airflow-kubernetes-pod-operator-high-workload"
@@ -113,6 +114,7 @@
             enum=["10Gi", "50Gi", "100Gi", "200Gi", "300Gi"],
             title="Docker container storage",
         ),
+        "use_ecr": Param(False, type="boolean", title="Log into AWS Elastic Container Registry (ECR)"),
     },
 )
 
@@ -143,6 +145,21 @@ def setup(ti=None, **context):
     logging.info(f"Selecting node pool={node_pool}")
     ti.xcom_push(key="node_pool", value=node_pool)
 
+    # select arguments and determine if ECR login is required
+    cwl_dag_args = json.loads(context["params"]["cwl_args"])
+    logging.info("Use ECR: %s", context["params"]["use_ecr"])
+    if context["params"]["use_ecr"]:
+        # cwl_dag_args["cwltool:overrides"] = {
+        #     context["params"]["cwl_workflow"]: {
+        #         "requirements": {"DockerRequirement": {"dockerPull": ecr_uri}}
+        #     }
+        # }
+        ecr_login = os.environ["AIRFLOW_VAR_ECR_URI"]
+        ti.xcom_push(key="ecr_login", value=ecr_login)
+        logging.info("ECR login: %s", ecr_login)
+    ti.xcom_push(key="cwl_dag_arguments", value=json.dumps(cwl_dag_args))
+    logging.info("CWL DAG arguments: %s", cwl_dag_args)
+
 
 setup_task = PythonOperator(task_id="Setup", python_callable=setup, dag=dag)
 
@@ -156,7 +173,14 @@ def setup(ti=None, **context):
     in_cluster=True,
     get_logs=True,
     startup_timeout_seconds=1800,
-    arguments=["{{ params.cwl_workflow }}", "{{ params.cwl_args }}"],
+    arguments=[
+        "-w",
+        "{{ params.cwl_workflow }}",
+        "-j",
+        "{{ ti.xcom_pull(task_ids='Setup', key='cwl_dag_arguments') }}",
+        "-e",
+        "{{ ti.xcom_pull(task_ids='Setup', key='ecr_login') }}",
+    ],
     container_security_context={"privileged": True},
     container_resources=CONTAINER_RESOURCES,
     container_logs=True,
diff --git a/airflow/docker/cwl/docker_cwl_entrypoint.sh b/airflow/docker/cwl/docker_cwl_entrypoint.sh
index 867e3d6b..dbaabaf3 100755
--- a/airflow/docker/cwl/docker_cwl_entrypoint.sh
+++ b/airflow/docker/cwl/docker_cwl_entrypoint.sh
@@ -1,22 +1,30 @@
 #!/bin/sh
 # Script to execute a CWL workflow that includes Docker containers
 # The Docker engine is started before the CWL execution, and stopped afterwards.
-# $1: the CWL workflow URL
+# -w: the CWL workflow URL
 #     (example: https://github.com/unity-sds/sbg-workflows/blob/main/L1-to-L2-e2e.cwl)
-# $2: a) the CWL job parameters as a JSON formatted string
+# -j: a) the CWL job parameters as a JSON formatted string
 #        (example: { "name": "John Doe" })
 #  OR b) The URL of a YAML or JSON file containing the job parameters
 #        (example: https://github.com/unity-sds/sbg-workflows/blob/main/L1-to-L2-e2e.dev.yml)
-# $3: optional path to an output JSON file that needs to be shared as Airflow "xcom" data
+# -e: the ECR login URL where the AWS account ID and region are specific to the Airflow installation
+#        (example: <aws_account_id>.dkr.ecr.<region>.amazonaws.com) [optional]
+# -o: path to an output JSON file that needs to be shared as Airflow "xcom" data [optional]
 
 # Must be the same as the path of the Persistent Volume mounted by the Airflow KubernetesPodOperator
 # that executes this script
 WORKING_DIR="/scratch"
 
 set -ex
-cwl_workflow=$1
-job_args=$2
-json_output=$3
+while getopts w:j:e:o: flag
+do
+  case "${flag}" in
+    w) cwl_workflow=${OPTARG};;
+    j) job_args=${OPTARG};;
+    e) ecr_login=${OPTARG};;
+    o) json_output=${OPTARG};;
+  esac
+done
 
 # create working directory if it doesn't exist
 mkdir -p "$WORKING_DIR"
@@ -48,9 +56,20 @@ do
   sleep 1
 done
 
+# Activate Python virtual environments for executables
+. /usr/share/cwl/venv/bin/activate
+
+# Log into AWS ECR repository
+if [ "$ecr_login" != "None" ]; then
+IFS=. read account_id dkr ecr aws_region amazonaws com <<EOF
+${ecr_login}
+EOF
+aws ecr get-login-password --region $aws_region | docker login --username AWS --password-stdin $ecr_login
+echo "Logged into: $ecr_login"
+fi
+
 # Execute CWL workflow in working directory
 # List contents when done
-. /usr/share/cwl/venv/bin/activate
 pwd
 ls -lR
 cwl-runner --debug --tmp-outdir-prefix "$PWD"/ --no-read-only "$cwl_workflow" "$job_args"
diff --git a/airflow/helm/values.tmpl.yaml b/airflow/helm/values.tmpl.yaml
index 7f385891..449b57a2 100644
--- a/airflow/helm/values.tmpl.yaml
+++ b/airflow/helm/values.tmpl.yaml
@@ -273,6 +273,8 @@ env:
     value: "${unity_cluster_name}"
   - name: "AIRFLOW_VAR_KARPENTER_NODE_POOLS"
     value: "${karpenter_node_pools}"
+  - name: "AIRFLOW_VAR_ECR_URI"
+    value: "${cwl_dag_ecr_uri}"
 
 # https://airflow.apache.org/docs/apache-airflow/stable/administration-and-deployment/security/api.html
 extraEnv: |
diff --git a/terraform-unity/modules/terraform-unity-sps-airflow/main.tf b/terraform-unity/modules/terraform-unity-sps-airflow/main.tf
index a11f7dda..17227245 100644
--- a/terraform-unity/modules/terraform-unity-sps-airflow/main.tf
+++ b/terraform-unity/modules/terraform-unity-sps-airflow/main.tf
@@ -143,7 +143,9 @@ resource "aws_iam_policy" "airflow_worker_policy" {
             "sqs:SendMessage",
             "sqs:ReceiveMessage",
             "sns:Publish",
+            "ecr:GetAuthorizationToken",
             "ecr:GetDownloadUrlForLayer",
+            "ecr:BatchCheckLayerAvailability",
             "ecr:BatchGetImage",
             "secretsmanager:GetSecretValue",
             "ssm:GetParameters",
@@ -382,6 +384,7 @@ resource "helm_release" "airflow" {
       unity_venue              = var.venue
       unity_cluster_name       = data.aws_eks_cluster.cluster.name
       karpenter_node_pools     = join(",", var.karpenter_node_pools)
+      cwl_dag_ecr_uri          = "${data.aws_caller_identity.current.account_id}.dkr.ecr.us-west-2.amazonaws.com"
     })
   ]
   set_sensitive {