How many cards can I get for every boarding pass?

For every boarding pass that you scan, you can select two out of four cards available. These cards are related to the flights, and can be cities, aircraft, airlines, or even special cards!

Here is an example:

1. From Berlin to Munich and return: you receive 4 cards in total;

2. From Berlin to San Francisco, through Frankfurt and return: you receive 8 cards in total, 2 per each flight;