I believe that it's fine to leave the Flight No / Address etc. blank .. theoretically you can log back into the site and fill them in for each trip (I never have!)
It makes no sense to fill them up really on an authorisation that's valid for multiple trips.
[broken link removed]
Thank you all for your very helpful advice, including the "free" application web address.
I got travel authorization, valid for two years. What does that mean exactly - If I want to travel to the USA again within the two years, I dont have to fill in this online form again?
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