Miles & More and Marriott Bonvoy offer a new promotion together allowing you to earn 6 extra miles for each USD spent.
Miles & More this month offers you 6 miles per USD spent for each booking made trough a dedicated miles & more link.
You have to book your stay until October 31.
Access the promotion site here, enter your miles & more number and start earning extra miles.
You will still receive the usual Marriott Bonvoy points as well.