Mokshu

Award Booking Classes for Flying Blue

Air France / AF Flights
Long haul & COI
Premičre Flex: F (FB Elite members only)
Affaires Flex: C
Affaires Classic: O (+ extra availability for Elite customers)
Premium Voyageur Flex: S
Premium Voyageur Classic: A
Voyageur Flex: B
Voyageur Elite: L
Voyageur Classic: X

Medium, short haul & Intra COI
Affaires Flex: C
Affaires Classic: O
Alizé Flex: S (Intra COI)
Alizé Flex: A (Intra COI)
Premium Eco Flex: W / Y (Intra COI + COI-USA)
Voyageur Classic: X

KLM / KL Flights
Intercontinental
Business Flex: C
Business Classic: O (+ extra availability for Elite customers)
Economy Flex: B
Economy Classic: W (+ extra availability for Elite customers)

Europe
Business Flex: C
Business Classic: O (+ extra availability for Elite customers)
Economy Flex: B
Economy Classic: W (+ extra availability for Elite customers)


Kenya Airways / KQ Flights
Economy Classic : W
Economy Flex : S
Business Classic : O
Business Flex : C

Air Europa / UX Flights
Economy Classic : A
Economy Flex : B
Business Classic : P
Business Flex : I

Air Calin/ SB Flights
Economy Classic : X
Business Classic : O

Other main carriers

Aeroflot / SU Flights
Economy Classic : X
Business Classic : O

Aeromexico / AM Flights
Economy Classic : U
Business Classic : C

Alitalia / AZ Flights
Economy Classic : U
Business Classic : Z

China Southern Airlines / CZ Flights
Economy Classic : O
Business Classic : I
First Classic : P

Czech Airlines / OK Flights
Economy Classic : E
Business Classic : Z

Delta Air Lines / DL Flights
Economy Classic : N
Business Classic : O
First Classic : R / O

Japan Airlines / JL Flights
Economy Classic : T
Business Classic : U

Korean Air / KE Flights
Economy Classic : U
Business Classic : D

Northwest Airlines / NW Flights
Economy Classic : W
Economy Flex : Y
Business Classic : D
Business Flex : C
First Classic : A
First Flex : P

Other airlines

Airlinair / A5 Flights
Economy Classic : X

Avianca / AV Flights
Economy Classic : Z
Business Classic : A

Baboo / F7 Flights
Economy Classic : Z
Business Classic : E

Bangkok Airways / PG Flights
Economy Classic : Y

CCM Airlines / XK Flights
Economy Classic : X

Comair / MN Flights
Economy Classic : X
Business Classic : U

Copa Airlines / CM Flights
Economy Classic : G
Business Classic : E

GOL / G3 Flights
Economy Classic : X
Business Classic : I

Jet Airways / 9W Flights
Economy Classic : X
Business Classic : D

Kingfisher Airlines / IT Flights
Economy Classic : R
Business Classic : Z

Malaysia Airlines / MH Flights
Economy Classic : T
Business Classic : I

Malev Hungarian / MA Flights
Economy Classic : X
Business Classic : R

Martinair / MP Flights
Economy Classic : W

Middle East Airlines / ME Flights
Economy Classic : X
Business Classic : R

SAM / MM Flights
Economy Classic : Z
Business Classic : A

Twin Jet / T7 Flights
Economy Classic : W

VLM Airlines / VG Flights
Economy Classic : P
Business Classic : O

I can't guarantee this information to be 100% up to date (especially for "minor" carriers).