I am considering doing HKG-BCN in early June and SU doesn't have O inventory for my dates of travel (at least not HKG-SVO-HKG).
When I use EF to search for KLM flights, there is no O inventory but there is "C" or "flex award for elites". Is this class available only to KLM elites and not DL.
The flights I want do not show on DL web, namely 6/5 - 6/10.