https://www.devex.com/people/how-do-i-add-an-infant-to-my-southwest-airlines-2363686
https://www.devex.com/people/can-i-add-infant-to-southwest-airlines-first-class-reservation-confirmation-2363727
https://www.devex.com/people/how-to-add-an-infant-to-delta-airlines-first-class-2360622
https://www.devex.com/people/can-you-add-a-lap-baby-after-booking-a-flight-with-delta-airlines-2360603
https://www.devex.com/people/does-delta-airlines-allow-last-minute-bookings-for-infants-2360522