It depends on the program itself. For some of them, we can import all flights, and for others, we can only import upcoming flights.
NOTE: The import takes place during your first login and every week thereafter. If during the first week, the system is updated with added flights from your loyalty profile, we will check your connected loyalty accounts more often for new flights.
By the way, you can find out which flights we can import from the loyalty program. Just check the information for each of them. You can see if there is an option to import only future flights, only past flights, or all flights.
Simply swipe the program name to the left and click the "Sync" button.
Click on the program name and select "Sync Now".
You should see a "Pending" status. In time, the balance will be updated, and we will import flights according to the supported airline program.