Originally Posted by writerguyfl

The industry standard is that your room is held until the official check-out time the morning after your original arrival. Hotels in cities with a lot of arriving red-eye flights (like Paris) will see this scenario on a daily basis.

If the potential flight issues still have you arriving before check-out time, you should be fine.

If you have difficulty finding an English-speaker when calling, you can use the Contact form on the Marriott website. Enter "Please forward this question to the hotel" or similar at the start of the Comments box. The message will be sent to the hotel via Marriott's internal communications system. It may take a few days, but the hotel is required to contact you back.

https://www.marriott.com/marriott/contact.mi