Open: 30 hours before scheduled departure 
Close: 30 minutes before scheduled departure 

Note: Available from 24 hours before departure for flights to the United States

• An e-ticket issued by KLM, AIR FRANCE or Northwest Airlines is all you need
• Online check-in is possible with both hand baggage and hold baggage
• When traveling alone, or in a group of not more than nine persons    

Not all airports allow check-in beforehand 
Due to immigration, safety and airport limitations, certain airports do not allow to print your own boarding pass ahead of time. In these cases, you can use a self-service check-in machine or go to the check-in desk at the airport.