diff --git a/metadata-ingestion-modules/airflow-plugin/setup.py b/metadata-ingestion-modules/airflow-plugin/setup.py
index a5af881022d8c..e88fc870cb333 100644
--- a/metadata-ingestion-modules/airflow-plugin/setup.py
+++ b/metadata-ingestion-modules/airflow-plugin/setup.py
@@ -101,6 +101,10 @@ def get_long_description():
     f"acryl-datahub[testing-utils]{_self_pin}",
     # Extra requirements for loading our test dags.
     "apache-airflow[snowflake]>=2.0.2",
+    # Connexion's new version breaks Airflow:
+    # See https://github.com/apache/airflow/issues/35234.
+    # TODO: We should transition to using Airflow's constraints file.
+    "connexion<3",
     # https://github.com/snowflakedb/snowflake-sqlalchemy/issues/350
     # Eventually we want to set this to "snowflake-sqlalchemy>=1.4.3".
     # However, that doesn't work with older versions of Airflow. Instead
diff --git a/metadata-ingestion/src/datahub/ingestion/api/decorators.py b/metadata-ingestion/src/datahub/ingestion/api/decorators.py
index 5e4427047104f..b390ffb9dd036 100644
--- a/metadata-ingestion/src/datahub/ingestion/api/decorators.py
+++ b/metadata-ingestion/src/datahub/ingestion/api/decorators.py
@@ -93,10 +93,20 @@ def capability(
     """
 
     def wrapper(cls: Type) -> Type:
-        if not hasattr(cls, "__capabilities"):
+        if not hasattr(cls, "__capabilities") or any(
+            # It's from this class and not a superclass.
+            cls.__capabilities is getattr(base, "__capabilities", None)
+            for base in cls.__bases__
+        ):
             cls.__capabilities = {}
             cls.get_capabilities = lambda: cls.__capabilities.values()
 
+            # If the superclasses have capability annotations, copy those over.
+            for base in cls.__bases__:
+                base_caps = getattr(base, "__capabilities", None)
+                if base_caps:
+                    cls.__capabilities.update(base_caps)
+
         cls.__capabilities[capability_name] = CapabilitySetting(
             capability=capability_name, description=description, supported=supported
         )
diff --git a/metadata-ingestion/src/datahub/ingestion/source/state/stateful_ingestion_base.py b/metadata-ingestion/src/datahub/ingestion/source/state/stateful_ingestion_base.py
index 7fb2cf9813cab..d11b1f9ad6a53 100644
--- a/metadata-ingestion/src/datahub/ingestion/source/state/stateful_ingestion_base.py
+++ b/metadata-ingestion/src/datahub/ingestion/source/state/stateful_ingestion_base.py
@@ -15,11 +15,12 @@
 from datahub.configuration.time_window_config import BaseTimeWindowConfig
 from datahub.configuration.validate_field_rename import pydantic_renamed_field
 from datahub.ingestion.api.common import PipelineContext
+from datahub.ingestion.api.decorators import capability
 from datahub.ingestion.api.ingestion_job_checkpointing_provider_base import (
     IngestionCheckpointingProviderBase,
     JobId,
 )
-from datahub.ingestion.api.source import Source, SourceReport
+from datahub.ingestion.api.source import Source, SourceCapability, SourceReport
 from datahub.ingestion.source.state.checkpoint import Checkpoint, StateType
 from datahub.ingestion.source.state.use_case_handler import (
     StatefulIngestionUsecaseHandlerBase,
@@ -177,6 +178,11 @@ class StatefulIngestionReport(SourceReport):
     pass
 
 
+@capability(
+    SourceCapability.DELETION_DETECTION,
+    "Optionally enabled via `stateful_ingestion.remove_stale_metadata`",
+    supported=True,
+)
 class StatefulIngestionSourceBase(Source):
     """
     Defines the base class for all stateful sources.