From the announcement:
To celebrate the arrival of the first Wings of Glory WW2 releases, Ares Games promotes a contest from March 7th to 15th that will award one different WW2 Airplane Pack every day, plus a WW2 Starter Set on the final day.
Each day, at 16:30 GMT, we will publish here one quiz about WW2 planes, pilots and such. You do not need to be an expert – the answers are not so easy, but they can be found if you look for them! All answers can be found somewhere in Internet, and you can also find some of them in the previews articles published here.