We should list the classes of service for miles redemption available to see in the gds.
An old list i have in my notes - not sure all are 100% up to date. Enjoy.
Aerolinas Argentinas: U (business class award), X (economy award), I (business class upgrade)
Aer Lingus: U (business class award), T (economy award)
Aeromexico: R (business class upgrade)
Aeroplan: R (business class upgrade)
Aircalin: O (business class award), X (economy award)
Air Europa: Z (business class award), A (economy award)
Air France: O (business class award)
Air Tahiti Nui: A (first class award), I (business class award), W (economy award), Z (business class upgrade)
Alaska Airlines: A (first class award), U (first class upgrade), W (economy award)
Avianca: A (business class award), Z (economy award)
Bangkok Airlines: Y (economy award)
Brussels Airlines: I (business class award or upgrade), X (economy award)
CCM Airlines: X (economy award)
China Eastern: A (first class award), D (business class award), I (economy award)
China Southern: P (first class award), I (business class award), O (economy award)
Czech Airlines: Z (business class award), E (economy award), I (business class upgrade)
El Al: P (first class award), X (business class award), E (economy award), A (first class upgrade), R (business class upgrade)
Etihad: R (first class upgrade), X (business class upgrade)
Gol: I (business class award), X (economy award)
Gulf Air: P (business class award), T (economy award)
Hainan Airlines: A (business class award), S (economy award)
Hawaiian Airlines: U (economy award), P (first class upgrade)
Icelandair: Z (business class award)
Korean Airlines: A (first class award/upgrade), Z (business upgrade)
Martinair: W (economy award)
Saudi Arabian: A (first class award), D (business award), L (economy award)
Shanghai Airlines: O (first class award), I (business class award), X (economy award)
Tarom: Z (business class award), X (economy award)
Transaero Airlines: E (economy award)
Turkish: J (business class upgrade using Miles&Smiles miles)
Virgin Australia: H (business class award)