Originally Posted by AviationFan

I am going on a trip with Northwest to Germany with my three-year-old daughter in a few days. She's been there with me and my wife several times, but this will be the first time that Mommy stays at home in the U.S. She'll actually meet us later in Germany, such that for the return all three of us will be travelling together.

Looking at a section called International Travel With Minors on nwa.com suggests that a notarized consent form is needed, but the wording is a little vague ("Many countries require documentary evidence...", "often need proof of custody", etc.) My question for those that have travelled as a single parent with their children between the U.S. and Europe before: what is really required for such a trip?

Thanks in advance for your advise!

- Martin