https://support.captureone.com/hc/en-us/community/posts/21969390428061-What-is-confirmation-code-for-United-Airlineshttps://support.captureone.com/hc/en-us/community/posts/21969390428061-What-is-confirmation-code-for-United-Airlines

Is the booking number the flight number? No.  1-888-829-1467 (𝙾𝚃𝙰) (𝙾𝚃𝙰) While the flight number is used by air travelers for orientation at the airport, the booking number is more important for the airline. After all, they can use it to view the most important information about each booking.