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The ticket office at major stations such as the airport will be open even on a holiday. In addition, there are ticket machines that accept credit cards (all of them, since this is an RATP station — on the other hand, SNCF stations such as in Roissy airport have machines that only accept credit cards with chips), and I think the ones in the airport also take ...
As far as I know, when entering the US by air, you always pass through customs at your first US stop, at which point you have to claim and recheck your luggage. The only exceptions is if your origin or another stopover is at a "preclearance" airport outside the US, in which case you clear US customs there. Most of these are in Canada and CDG is not one.
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