A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 102,617
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.