As I've said in my previous reply, we don't have any means to check why PayPal has denied your purchase, because we don't handle payments, don't have your payment details, don't receive your money, and the purchase is not made on our site either, it's all handled by Esellerate
We tried to ask PayPal, just because users asked for it but, for the same aforementioned reasons, PayPal won't discuss with us about this, because we are NOT their customers: Esellerate is.
From what we gathered by asking Esellerate, which also started an investigation about this, it seems that PayPal, for some reason, has decided that our flight simulator sceneries could fall into the category of restricted goods that cannot be sold. Most likely, some kind of automatic security trigger has been enabled, maybe they assumed such airports could be used by terrorist to plan attacks...as far as we know, Esellerate was trying to prove that many flight developers sells the same products through PayPal, but we haven't heard back from them.