https://www.devex.com/people/infant-travel-adding-a-baby-to-a-frontier-flight-ticket-2370210
https://www.devex.com/people/guide-to-including-an-infant-on-a-frontier-airlines-reservation-2370252
https://www.devex.com/people/nonstop-ser-vice-how-to-add-an-infant-on-a-delta-flight-ticket-2368598
https://www.devex.com/people/how-to-add-lap-infant-delta-after-booking-international-on-flights-2368674
https://www.devex.com/people/how-do-i-add-a-lap-infant-to-my-delta-flight-2370397