It’s two seperate inquiries.
#1) I’m looking at ATS’s ( now Ryan Air Services - RYA) and in thier flight number columb they have the word “FLAG” listed what’s that mean?
#2) I’ve also looked at the cargo sched for ANA Cargo. In their columb for aircraft ( for example on a partner flight QJ1320) the aircraft listed to flight it is “RFS”. What’s that?