Nothing to worry about, usually CBP staff will not need to speak a lot with the passengers (especially ones from EU), if they do, they will ask simple stuff like “Ticket” or something like this. Anyway, in case the CBP agent wants to speak with the passenger and the language was a barrier, they usually will do one of the following:
I can’t find an official reference to confirm this, but I know it for a fact out of personal experience as I work for an airline and I have been to the US many times.
Update: I have found a reference that confirms CBP might ask other passengers to help.
Credit:stackoverflow.com‘
5 Mar, 2024
5 Mar, 2024