diff --git a/alembic/versions/163f6213d3f_remove_unused_fields_from_takeoff_.py b/alembic/versions/163f6213d3f_remove_unused_fields_from_takeoff_.py
new file mode 100644
index 0000000..efef5e4
--- /dev/null
+++ b/alembic/versions/163f6213d3f_remove_unused_fields_from_takeoff_.py
@@ -0,0 +1,26 @@
+"""remove unused fields from takeoff_landing
+
+Revision ID: 163f6213d3f
+Revises: 258a3f6bbdc
+Create Date: 2016-06-03 20:05:20.749369
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '163f6213d3f'
+down_revision = '258a3f6bbdc'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.drop_column('takeoff_landing', 'altitude')
+    op.drop_column('takeoff_landing', 'ground_speed')
+
+
+def downgrade():
+    op.add_column('takeoff_landing', sa.Column('altitude', sa.Integer))
+    op.add_column('takeoff_landing', sa.Column('ground_speed', sa.Float))
diff --git a/ogn/collect/logbook.py b/ogn/collect/logbook.py
index 4d2ccb1..2593e2e 100644
--- a/ogn/collect/logbook.py
+++ b/ogn/collect/logbook.py
@@ -98,8 +98,6 @@ def compute_takeoff_and_landing():
     takeoff_landing_query = app.session.query(
         sq2.c.timestamp,
         sq2.c.track,
-        sq2.c.ground_speed,
-        sq2.c.altitude,
         sq2.c.is_takeoff,
         sq2.c.device_id,
         Airport.id) \
@@ -110,8 +108,6 @@ def compute_takeoff_and_landing():
     # ... and save them
     ins = insert(TakeoffLanding).from_select((TakeoffLanding.timestamp,
                                               TakeoffLanding.track,
-                                              TakeoffLanding.ground_speed,
-                                              TakeoffLanding.altitude,
                                               TakeoffLanding.is_takeoff,
                                               TakeoffLanding.device_id,
                                               TakeoffLanding.airport_id),
diff --git a/ogn/model/takeoff_landing.py b/ogn/model/takeoff_landing.py
index 61e33e0..8842ac8 100644
--- a/ogn/model/takeoff_landing.py
+++ b/ogn/model/takeoff_landing.py
@@ -1,9 +1,7 @@
-from sqlalchemy import Boolean, Column, Float, Integer, DateTime, ForeignKey
+from sqlalchemy import Boolean, Column, Integer, DateTime, ForeignKey
 from sqlalchemy.orm import relationship
-from geoalchemy2.shape import to_shape
 
 from .base import Base
-from .geo import Location
 
 
 class TakeoffLanding(Base):
@@ -11,11 +9,8 @@ class TakeoffLanding(Base):
 
     id = Column(Integer, primary_key=True)
 
-    altitude = Column(Integer)
     timestamp = Column(DateTime, index=True)
     track = Column(Integer)
-    ground_speed = Column(Float)
-
     is_takeoff = Column(Boolean)
 
     # Relations
@@ -24,11 +19,3 @@ class TakeoffLanding(Base):
 
     device_id = Column(Integer, ForeignKey('device.id', ondelete='SET NULL'), index=True)
     device = relationship('Device', foreign_keys=[device_id])
-
-    @property
-    def location(self):
-        if self.location_wkt is None:
-            return None
-
-        coords = to_shape(self.location_wkt)
-        return Location(lat=coords.y, lon=coords.x)