That's a good question. If I were to buy the 30-day flight pass, could I then - one day before departure - change the flight to 30 days later? Though the price difference between the 30 and 0-day pass seems rather small, so it may be worth just going for the 0-day Pass...

I've got my travel pretty much booked for this summer, but am missing one single flight to ATH mid July. Prices are absurd from AMS/DUS due to the start of summer holidays. Like 250-300 euro one-way in Economy.

So I'm also considering a 6-flight pass from DUS. The one July flight will already 'cover' 200 euro of the 500 pass fee, leaving 300 euro for 5 flights (60 euro ex tax, 100 euro incl tax per flight). Thats quite a bit higher than the min price on that route, however it does give more miles and allows to use the flights with 0-day notice. Which may be very useful for last minute travel. Also with coupon upgrades this may be useful as it allows switching to whichever flight that has I-class availability last minute.

My main issue is that DUS is not very convenient to reach (an extra hour of travel), and Aegean's schedule on this route practically only allows me to fly DUS-ATH (and not the other way around). Which makes it less convenient. I need Aegean to add AMS as a Pass destination

Alternatively I can just book LH in business class from AMS for about 500 euro roundtrip. I only need a one-way for the summer but will be able to use the return of the roundtrip later this year. Price-wise that's already a better deal compared to buying a single economy flight. Hmm.. choices choices..