I have a neat viral marketing / mailing list building idea for you if you like - a local radio news station here has a "weather guarantee". They have a pool of

I have a neat viral marketing / mailing list building idea for you if you like - a local radio news station here has a "weather guarantee". They have a pool of prize money which increases daily. Every day on the radio they say what their guaranteed weather high is - if they don't hit it, they pick a name from their member database and give them the pool and start over again. Therefore you must join their database in order to win the prize - and the contest itself reaffirms the accuracy of the radio broadcast (if they are willing to be against their weather estimates they must be good!) What you can do is have the same model with a daily flight time guarantee, and give away a free copy of the app as a prize. People who are going to buy your app will likely do it anyways, so this is a way to collect all the info of the "tire kickers" so you can slowly remind them over 3-12 months why they should buy your app. The viral part can come from getting additional entries in the pool by recommended your friends. Just a random thought that popped in my head - something to consider while you have all this early launch hype surrounding you..