Https://intercom.help/infanthelp/en/articles/11848643-flying-with-a-baby-how-to-add-an-infant-to-your-allegiant-airlines-itinerary https://intercom.help/infanthelp/en/articles/11848643-flying-with-a-baby-how-to-add-an-infant-to-your-allegiant-airlines-itinerary