public void MarkPassengerAsModified(Passenger item)
 {
     Entry(item).State = EntityState.Modified;
 }
 public void MarkPassengerAsModified(Passenger item) { }
 public void MarkAsDeleted(Passenger item)
 {
     Entry(item).State = EntityState.Deleted;
 }
 public void MarkAsDeleted(Passenger item) { }