Originally Posted by
Helios
FCI stands for "First Class Incoming". This is printed on your boarding pass when you are on a First Class ticket, but your connecting flight is in Business Class (e.g. no domestic First Class). That way you can use the FCL and check-in with you Business Class Boarding Pass.
I had FCI also on boarding passes without any connection flight. AFAIK FCI is on every boarding pass of FC-pax without beeing HON or HOC (HON Companion).
So no status, *S, FTL, *G, SEN pax have FCI on the BP and HONs and their companions have their 'real' status on the BP.