def add_delayed(df):
    """
    Add col Delayed. 0 = punctual, 1 = delayed by more than 10 min
    """
    _df = df.copy()
    delayed = []
    for index, row in _df.iterrows():
        if row['Timedelta'] > 10:
            delayed.append(1)
        else:
            delayed.append(0)
    _df['Delayed'] = delayed
    return _df