I am writing this to thank everyone who has helped me with the myriad of questions I have asked these past few months. I have arranged wheelchair service at JFK, CDG upon arrival, AMS (open jaw ticket), and JFK upon arrival home.
I have downloaded a bunch of Downton Abbey episodes for the flights on Amazon Prime, charged up my phones and iPod/iPad, and packed my RS Paris book I took out from the library. Sometimes I forget.
I have used the CityMapper app to save locations and routes for offline usage. I am not buying a SIM card as I'll be in Paris, Dortmund and Amsterdam so why bother. The Dortmund part is where wifi will be scarce as we're staying with friends in their town but I will probably not be online much.
Anyway, thank you all very much. :-)