Originally Posted by IceTrojan

You can look up LAX's direct phone number from the Avis website by doing a location search. Should be a (310) area code.

Confirm the agent is from LAX (when they get busy and don't answer the phone, you'll be transferred to a call center), and ask them to add a note to your reservation. They may or may not do it because it's a Hotwire reservation, but just explain why and it may happen.

EDIT: (310) 342-9200