I cannot figure this out.

A lot of talk on here about Air France, Virgin Atlantic, Korean and KLM.

When I search through the Delta.com website, the only partner that I am seeing is AS (Alaska).

Why am I not seeing flights operated by the others.

My searches were all departing on June 26th 2015 and returning July 19th 2015. I tried the multi day and the 5 week option as well as the fixed date. Results were all the same, no partner flights.

I searched ORD, DTW, JFK, MSP and IAD all to CDG and none showed an Air France option.

I searched ORD, DTW, JFK, MSP and IAD all to AMS and none showed a KLM option.

I searched ORD, DTW, JFK, MSP and IAD all to LHR and none showed an Virgin Atlantic option.

I also searched LAX and SFO to ICN and neither showed a Korean Air option.

Doe anyone have advice as to why many see partner flights, yet I am unable to see any?

Thanks in advance!