For airports without self check-in machines ... Then, stow these items safely before you go through the security checkpoint — as you don't want them to fall through the cracks or get forgotten.

Confirmation number (usually sent via email if ticket is purchased online or through a travel agency) Credit card used for payment of the ticket Passport Check in online before arriving to airport You ...

and some will allow going through security only 2-5 hours prior to departure (identical to check-in desk hours). In general, ...

This means that you can accompany someone inside the airport, help them check in their bags, and leave just before they go ...