An airline alliance is a group of airlines that team up so you can earn and spend frequent flyer miles across all of them, use shared airport lounges, and book smooth connections on a single ticket. The three global ones are Star Alliance, Oneworld, and SkyTeam.
Think of an airline alliance as a club of airlines that agree to treat each other's frequent flyers like their own. When carriers join forces, your miles, your elite status, and your lounge access stretch across every airline in the group, not just the one whose plane you boarded. There are three global alliances: Star Alliance, Oneworld, and SkyTeam.
The perks show up in three main places:
Plenty of big names stay independent. In the US, Southwest and JetBlue are not in any global alliance. Some large international carriers, like Emirates, also skip alliances and instead sign one-to-one partnership deals with individual airlines. So the alliance a carrier belongs to, or doesn't, is one more thing worth checking before you book.
What this means for you: pick one loyalty program inside an alliance and funnel your flying toward it. Even if you fly five different member airlines in a year, the miles and status pile up in a single account, which is how everyday travelers reach free flights and lounge access faster.
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