I am looking at a round trip flight from USA to Split Croatia. Probable departure flights are USA to Paris, change airlines Delta to Transavia and airports from CDG to ORY, fly Paris to Croatia same day. Return flight looks like Croatia to Paris with overnight stay in Paris due to timing problem. Flight leaves Split and arrives Paris at ORY. Next morning leave Paris CDG for USA. Question (1) on departure flight will I need to go through baggage claim and customs in Paris because of change in airlines and airports? Question (2) on return flight will in need to go through Babbage claim and customs in Paris due to overnight stay? Question (3) How much time should I allow for check in at Paris?