Question for people who know about Apps (I have never used them yet). The code for ebookers.ch is App18, does anyone know if there is a "travel by" date? I am traveling in Feb, and cannot find any codes yet.

Also, does anyone know if most of the discounts you get for downloading an app are one time use only? For instance, if I download the app, but then the discount does not work for travel in 2016, can I remove the app and try again later, or does it remember my phone. Lol, I am android dumb still.