Flying Colonel - Does Anybody Remember?
FO = flying orchid, female equivalent of FC.
FC still shows on manifest alongside with Medallion and MM status.
In the early 90's it was very helpful with IROPs. Also got inflight upgrades from C to F on my regular flights from CVG to FRA. Maybe was the Purser (Alexander) he flew the route regularly and welcomed me on board by last name at least 20 times :-) I start feeling old now...