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Originally Posted by MSPeconomist
The best experience would be to take the DL D1 service between LAX and JFK and the DL nonstop between JFK and NCE, also in D1. IIRC the latter route is seasonal; the OP doesn't give outbound dates but mentions May 15 for the return.
The OP writes that he has already booked TN LAX-CDG for the outbound.