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https://intercom.help/all-airlines-support/en/articles/10975515-%F0%9D%93%A3%F0%9D%93%B2%F0%9D%93%AC%F0%9D%93%B4%F0%9D%93%AE%F0%9D%93%BD%F0%9D%93%B2%F0%9D%93%B7%F0%9D%93%96-%F0%9D%93%A1%F0%9D%93%BE%F0%9D%93%B5%F0%9D%93%AE%F0%9D%93%BC-what-is-the-cheapest-day-to-buy-frontier-tickets