I am based in Europe, and I flew extensively through the Schengen area in the 12-month period of my choice. I also had a few flights outside the Schengen, including one to the US. None of my flights between foreign countries involved "travel on or over international waters for more than 24 hours or more". Does this mean that the only trip I need to report in this line is my trip to the US (since the US is not a foreign country)?
If yes, how should I count the Full days column? Would these be the day after my arrival up to the day before my departure (I arrived in an evening, and I left in an afternoon)?
If you are present in the US for any part of a US day, you count that as a US day. So the day of your arrival and the day of your departure would need to be counted.
Sounds good.
And you agree that I need not mention any other trips?
Thank you for checking back. I skipped over part of your question. You do not need to report trips to other countries, only US trips. Be sure if you did not have any US business days that you leave that field "blank". TurboTax will not accept a zero in that field. Wishing you well.