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https://central.xero.com/s/question/0D58V00009RjU8dSAF/united-bookingwhat-is-the-%F0%9D%97%B0%F0%9D%97%B5%F0%9D%97%B2%F0%9D%97%AE%F0%9D%97%BD%F0%9D%97%B2%F0%9D%98%80%F0%9D%98%81-%F0%9D%97%B1%F0%9D%97%AE%F0%9D%98%86-to-book-flight-on-united