Generally speaking, airlines on international routes release tickets 4-7 months in advance, and major airlines on domestic routes generally release tickets 1-3 months. It is the biggest pursuit of every airline to leave no seats when taking off, so most airlines are willing to release tickets 4-7 months in advance, which is not only cheaper, but also ensures the attendance rate. Of course, there is no guarantee that every airline can release tickets long before each booking. After all, every airline and agent has different time to release and collect tickets for sale.
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