British Airways is a founding member of the oneworld® alliance, which was established in 1999. In 2026, being part of oneworld means British Airways is partnered with other major carriers like American Airlines, Alaska Airlines, Cathay Pacific, Qantas, Qatar Airways, and Iberia. For travelers, this provides seamless connectivity across more than 900 destinations worldwide. If you have "Executive Club" status with British Airways (Bronze, Silver, or Gold), your benefits transfer across the alliance; for example, a BA Silver member is recognized as oneworld Sapphire, granting them access to American Airlines Admirals Clubs or the Qantas business lounges even when flying Economy. This alliance is also critical for the "Atlantic Joint Business" agreement, which allows BA and American Airlines to coordinate schedules and pricing between the US and Europe. It is a peer-to-peer "pro-tip" to check for codeshare flights; you can often book a flight on the BA website that is actually operated by American Airlines, allowing you to earn Avios and Tier Points at a different rate.