A good advice that I can give another fellow mom:
If you have a smartphone, look for the free white noise app. Lots of noises that will help your baby sooth or sleep wherever you are (plane, train, subway, on the go, on holidays, at your BFF’s house… WHEREVER and whenever because it doesn’t need wifi to run!).
No smartphone? Try using some videos from Youtube, just search “white noise” and you’ll find LOTS of videos some even last around 10 hours!
No internet around? Any of the items in the illustration work! Also others as a vacuum cleaner, fan, air conditioning… and of course, the “human white noise”: a quiet but constant “Shhhh” might do the trick 😉