https://www.devex.com/people/does-delta-airlines-allow-last-minute-bookings-for-infants-2360522
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https://www.devex.com/people/how-to-add-an-infant-to-delta-airlines-first-class-2360622
https://www.devex.com/people/how-to-add-an-infant-to-your-frontier-airlines-economy-flight-booking-2361699
https://www.devex.com/people/how-do-i-add-an-infant-to-my-klm-flight-2361928