The netAirspace watermark is our optional offer for photographers to protect their images against theft. As miamiair said, it should not influence the decision of the screeners.
Just wanted to add that, if you select to add a watermark, then no one at netAirspace will see the un-watermarked version of the photo. Not even the screeners.
You can also change the location, size and strength of the watermark retroactively, at any time. AFAIK, that's a unique feature for netAirspace

But I should also add that, at the moment, the watermarks are stronger than intended. That's a software problem we haven't fully been able to locate yet. But we still hope to get it fixed soon, so that the "very faint" setting will indeed deliver a very faint watermark.
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