It really depends on the program itself. For some of them we can import all flights but with others only upcoming flights.
NOTE: Importing occurs during the first login, and each week thereafter. If the system updates with added flights from your loyalty profile during the first week, to be thorough, we will check your connected loyalty accounts for new flights more frequently.
By the way, you can know which flights we can import from the loyalty program. Just check the information behind each of them. You can see if there is an opportunity to import only future, only past, or all flights.
Just swipe the program name left and tap on the "Sync" button.
Tap on the program name and select "Sync Now".
You should see status "Pending". In time the balance will be updated, and we will import flights according to the supported airline program.