diff --git a/game/ato/traveltime.py b/game/ato/traveltime.py
index 118ddda4..d3784d74 100644
--- a/game/ato/traveltime.py
+++ b/game/ato/traveltime.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 from datetime import datetime
 from typing import TYPE_CHECKING
 
-from game.utils import Distance, SPEED_OF_SOUND_AT_SEA_LEVEL, Speed, mach, meters
+from game.utils import Distance, SPEED_OF_SOUND_AT_SEA_LEVEL, Speed, mach
 
 if TYPE_CHECKING:
     from .flight import Flight
@@ -31,7 +31,7 @@ class GroundSpeed:
         # might. be sufficient given the wiggle room. We can come up with
         # another heuristic if needed.
         cruise_mach = max_speed.mach() * (0.7 if flight.is_helo else 0.85)
-        return mach(cruise_mach, altitude if not flight.is_helo else meters(0))
+        return mach(cruise_mach, altitude)
 
 
 # TODO: Most if not all of this should move into FlightPlan.