diff --git a/airflow/models/dag.py b/airflow/models/dag.py
index 1cb9220e58cac..0371ed9192c4d 100644
--- a/airflow/models/dag.py
+++ b/airflow/models/dag.py
@@ -507,7 +507,7 @@ def __init__(
 
             tzinfo = None if date.tzinfo else settings.TIMEZONE
             tz = pendulum.instance(date, tz=tzinfo).timezone
-        self.timezone = tz or settings.TIMEZONE
+        self.timezone: Timezone = tz or settings.TIMEZONE
 
         # Apply the timezone we settled on to end_date if it wasn't supplied
         if "end_date" in self.default_args and self.default_args["end_date"]:
@@ -607,9 +607,9 @@ def __init__(
                 f"Invalid values of dag.orientation: only support "
                 f"{ORIENTATION_PRESETS}, but get {orientation}"
             )
-        self.catchup = catchup
+        self.catchup: bool = catchup
 
-        self.partial = False
+        self.partial: bool = False
         self.on_success_callback = on_success_callback
         self.on_failure_callback = on_failure_callback
 
@@ -627,7 +627,7 @@ def __init__(
         self.is_paused_upon_creation = is_paused_upon_creation
         self.auto_register = auto_register
 
-        self.fail_stop = fail_stop
+        self.fail_stop: bool = fail_stop
 
         self.jinja_environment_kwargs = jinja_environment_kwargs
         self.render_template_as_native_obj = render_template_as_native_obj
diff --git a/airflow/settings.py b/airflow/settings.py
index e51cd208d9f74..0b56268acb962 100644
--- a/airflow/settings.py
+++ b/airflow/settings.py
@@ -568,12 +568,12 @@ def initialize():
 
 # By default Airflow plugins are lazily-loaded (only loaded when required). Set it to False,
 # if you want to load plugins whenever 'airflow' is invoked via cli or loaded from module.
-LAZY_LOAD_PLUGINS = conf.getboolean("core", "lazy_load_plugins", fallback=True)
+LAZY_LOAD_PLUGINS: bool = conf.getboolean("core", "lazy_load_plugins", fallback=True)
 
 # By default Airflow providers are lazily-discovered (discovery and imports happen only when required).
 # Set it to False, if you want to discover providers whenever 'airflow' is invoked via cli or
 # loaded from module.
-LAZY_LOAD_PROVIDERS = conf.getboolean("core", "lazy_discover_providers", fallback=True)
+LAZY_LOAD_PROVIDERS: bool = conf.getboolean("core", "lazy_discover_providers", fallback=True)
 
 # Determines if the executor utilizes Kubernetes
 IS_K8S_OR_K8SCELERY_EXECUTOR = conf.get("core", "EXECUTOR") in {
@@ -613,4 +613,10 @@ def initialize():
 
 # AIP-44: internal_api (experimental)
 # This feature is not complete yet, so we disable it by default.
-_ENABLE_AIP_44 = os.environ.get("AIRFLOW_ENABLE_AIP_44", "false").lower() in {"true", "t", "yes", "y", "1"}
+_ENABLE_AIP_44: bool = os.environ.get("AIRFLOW_ENABLE_AIP_44", "false").lower() in {
+    "true",
+    "t",
+    "yes",
+    "y",
+    "1",
+}