https://intercom.help/datechange/en/articles/11002752-how-do-i-get-a-ticket-sorted-for-a-lap-infant-on-allegiant-airlines

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https://intercom.help/travelinfant/en/articles/11002640-what-s-the-process-to-add-a-lap-infant-to-my-allegiant-airlines-trip-after-booking

https://intercom.help/travelinfant/en/articles/11002628-how-can-i-attach-a-minor-to-a-flight-i-ve-reserved-with-allegiant-airlines