dirrerence between Record Locator, Confirmation Number and PNR
What is the difference between a Record Locator, Confirmation Number and PNR? I booked an award ticket for my son in Business Class and I upgrade form paid Business to First on a VIPOW for SFO-LAX and LAX-JFK and i asked to have the reservation under the same PNR number, but I was told the EXP Desk that cannot be done becuase we are not on the same itinerary (I guess meaning class and hoe paid for tkt). Is this true? Thanks