DL has 1 daily with a late night out of TLV arriving like 5am into JFK, problem maybe if theres a ORD flight out of JFK early morn . If not and UA is out, Id probably want to send the kid with BA, at least its the same Term @ LHR and everyone speaks English which isnt then case @ CVG, dont do BA/AA as AA uses a different Term @ LHR. Another easy connection is Swiss (just dont how long the layover will be @ ZRH) TLV-ZRH goes into the E Gates and ORD leaves from the E Gates, and all passengers enter smack into the departure area of E, and I havent heard any horror storys about UMs on LX stay away from LH as arrival gate is miles away from departing and different concourses

seems DL has a 7am flight JFK-ORD but its from their other term @ JFK, arrive into T4 and depart T2, so shed need to take the airtrain and not the ones that go to the Subways. For that alone Id prefer BA or LX where the connection s/b alot easier as it will be in teh same T they arrive into