I have 4 family members traveling. Code GAKAGH. 3 of us are checking into the airport 2 hours in advance. But my son will be taking a red eye into NY to join us. Would he be able to check into the Admirals club without me?

You can also grand complimentary access for authorized users to your family members. There are restrictions but this is something you can do.

Technically, no. But you might get a sympathetic desk agent. Make sure your son has your AA frequent flyer number handy, as well as an ID with the same last name, and he might be fortunate. Also, technically a standard Club membership only allows one guest. I've never had an issue getting my family in, but you're probably pushing your luck asking for early guest entrance, and then showing up with 2 more guests.