It is important to be familiar with the airline alliances because these airline groupings may share their loyalty schemes and they also share fares, routes and around-the-world options

Here is a complete list:

There are three global airline alliances: oneworld, Star Alliance and Sky Team

ONEWORLD ALLIANCE

American Airlines (AA)
Finnair (AY)
British Airways (BA)
Cathay Pacific (CX)
Ibera (IB)
Dragonair (KA)
LAN Airlines (LA)
LAN Peru (LP)
Qantas (QF)
JAL Express (JC)
Japan Airlines (JL)
Jalways (JO)
Malev Hungarian Airlines (MA)
Mexicana (MX)
Japan Transocean (NU)
Royal Jordanian (RJ)
S7 Airlines (S7)
Lanecuador Aerolane (XL)
LAN Argentina (4M)

STAR ALLIANCE

Aegean Airlines (A3)
Air Canada (AC)
British Midland (BD)
Air China (CA)
Continental Airlines (CO)
TAM Linhas Airlines (JJ)
Spanair (JK)
Adria Airlines (JP)
Blue 1 (KF)
Lufthansa (LH)
Polish (LO)
Swiss (LX)
All Nippon (NH)
Air New Zealand (NZ)
Egypt Air (MS)
Austrian Airlines (OS)
Croatia Airlines (OU)
Asiana (OZ)
TAM Mercosur (PZ)
South African Airlines (SA)
SAS (SK)
Brussels Airlines (SN)
Singapore Airlines (SQ)
Thai Airways (TG)
Turkish Airlines (TK)
TAP Portugal (TP)
United Airlines (UA)
US Airways (US)

SKYTEAM

Air France (AF)
AeroMexico (AM)
Alitalia (AZ)
China Ailines (CI)
China Southern (CZ)
Delta (DL)
Shanghai Airlines (FM)
Korean Air (KE)
Kenya Airways (KQ)
KLM Royal Dutch Airlines (KL)
China Eastern (MU)
Czech Airlines (OK)
Tarom (RO)
Aeroflot (SU)