Apologies for your confusion about the 2 itineraries and for the benefit of 'irishguy28 'ONT' is the 3 letter code for Ontario International Airport USA, and a 'NON Operational Seat is NO KLM offering from Expedia while they claim to cover more than 400 Airlines around the world.

I was using the text from a WhatsApp communication that was carried out between KLM and myself, who understood it as it used the 3 letter codes for all the airports included in both the Delta & KLM Itineraries.

While I have opted for the Delta Itinerary as they have offered the 'Round Trip' with a saving of £1047 against the KLM alternative.

Although it means a 6 hour layover in ATL (Which is Atlanta USA) Delta's Customer Service advice for the layover was 'Get a Sky Club Day Pass' which is an excellent suggestion.