public void RemoveUserFromFlight(UserFlight user) { Attendances.Remove(user); }
public void RemoveFlight(UserFlight userFlight) { UserFlights.Remove(userFlight); }
public void AddUserToFlight(UserFlight user) { Attendances.Add(user); }
public void AddFlight(UserFlight userFlight) { UserFlights.Add(userFlight); }