My in-laws are visiting from Turkey and will be returning on the 17th of April. Their return itinerary is DL from CVG to ORD connecting to TK (Turkish Airlines) to IST and on to ADB(Izmir). They were ticketed seperately for the US domestic portion of the trip and have less than two hours to change in Chicago on the return trip. My question is will they be able to check their luggage through to IST from CVG, or will they have to pick them up and recheck them in Chicago? Either way would you recommend they standby for an earlier flight so that they don't risk missing the connection since they are on seperate tickets?