diff --git a/gen/aircraft.py b/gen/aircraft.py
index e4c3443f..9e67e521 100644
--- a/gen/aircraft.py
+++ b/gen/aircraft.py
@@ -228,7 +228,7 @@ class FlightData:
     friendly: bool
 
     #: Number of seconds after mission start the flight is set to depart.
-    departure_delay: int
+    departure_delay: timedelta
 
     #: Arrival airport.
     arrival: RunwayData
@@ -250,7 +250,7 @@ class FlightData:
 
     def __init__(self, package: Package, flight_type: FlightType,
                  units: List[FlyingUnit], size: int, friendly: bool,
-                 departure_delay: int, departure: RunwayData,
+                 departure_delay: timedelta, departure: RunwayData,
                  arrival: RunwayData, divert: Optional[RunwayData],
                  waypoints: List[FlightWaypoint],
                  intra_flight_channel: RadioFrequency) -> None:
@@ -277,10 +277,6 @@ class FlightData:
     def aircraft_type(self) -> FlyingType:
         """Returns the type of aircraft in this flight."""
         return self.units[0].unit_type
-    
-    @property
-    def departure_delay_delta(self) -> timedelta:
-        return timedelta(seconds=self.departure_delay)
 
     def num_radio_channels(self, radio_id: int) -> int:
         """Returns the number of preset channels for the given radio."""
@@ -1065,6 +1061,9 @@ class AircraftConflictGenerator:
         # And setting *our* waypoint TOT causes the takeoff time to show up in
         # the player's kneeboard.
         waypoint.tot = estimator.takeoff_time_for_flight(flight)
+        # And finally assign it to the FlightData info so it shows correctly in
+        # the briefing.
+        self.flights[-1].departure_delay = start_time
 
     @staticmethod
     def should_activate_late(flight: Flight) -> bool:
diff --git a/gen/briefinggen.py b/gen/briefinggen.py
index e80cb50a..b8f52d10 100644
--- a/gen/briefinggen.py
+++ b/gen/briefinggen.py
@@ -232,13 +232,13 @@ class MissionInfoGenerator:
 
 class BriefingGenerator(MissionInfoGenerator):
 
-    def __init__(self, mission: Mission, game: "Game"):
+    def __init__(self, mission: Mission, game: Game):
         super().__init__(mission, game)
         self.allied_flights_by_departure: Dict[str, List[FlightData]] = {}
         env = Environment(
             loader=FileSystemLoader("resources/briefing/templates"),
             autoescape=select_autoescape(
-                disabled_extensions=("txt"),
+                disabled_extensions=("txt",),
                 default_for_string=True,
                 default=True,
                 )
@@ -267,7 +267,7 @@ class BriefingGenerator(MissionInfoGenerator):
         for flight in self.flights:
             if not flight.client_units and flight.friendly:
                 name = flight.departure.airfield_name
-                if name in self.allied_flights_by_departure.keys():  # where else can we get this?
+                if name in self.allied_flights_by_departure:  # where else can we get this?
                     self.allied_flights_by_departure[name].append(flight)
                 else:
                     self.allied_flights_by_departure[name] = [flight]
diff --git a/resources/briefing/templates/briefingtemplate_EN.j2 b/resources/briefing/templates/briefingtemplate_EN.j2
index c1d99aae..04da95b4 100644
--- a/resources/briefing/templates/briefingtemplate_EN.j2
+++ b/resources/briefing/templates/briefingtemplate_EN.j2
@@ -25,7 +25,7 @@ Planned ally flights:
 {{ dep }}
 ---------------------------------------------------
 {% for flight in allied_flights_by_departure[dep] %}
-{{ flight.flight_type.name }} {{ flight.units[0].type }} x {{flight.size}}, departing in {{ flight.departure_delay_delta }}, {{ flight.package.target.name}}{% endfor %}
+{{ flight.flight_type.name }} {{ flight.units[0].type }} x {{flight.size}}, departing in {{ flight.departure_delay }}, {{ flight.package.target.name}}{% endfor %}
 {% endfor %}
 
 Carriers and FARPs:
@@ -42,7 +42,7 @@ AWACS:
 {% for i in awacs %}{{ i.callsign }} -- Freq : {{i.freq.mhz}}
 {% endfor %}
 
-JTACS [F-10 Menu] : 
+JTACS [F-10 Menu] :
 ====================
 {% for jtac in jtacs %}Frontline {{ jtac.region }} -- Code : {{ jtac.code }}
 {% endfor %}