Originally Posted by
missydarlin
The most important parts of that website:
1. To complete your lap infant request, please call Alaska Airlines Reservations at 1-800-ALASKAAIR (1-800-252-7522) with your confirmation code.
2. Lap infants traveling to an international destination (outside of North America) must be ticketed at 10% of the accompanying adult's fare. This does not guarantee them a seat. Infants can travel as lap infants for free (limit one lap infant per accompanying adult). If there is an empty seat available on that flight, the infant may occupy that seat for no extra charge.
What I'm unclear about #2 is if Alaska considers Mexico part of North America. Airlines are funny about geography.