When someone's booking a ticket and after booking their ticket—the day of travel—they can go on the websites of airports to see what services are available, and they can plan their needs that way.
In some cases, a passenger can arrive and, if they would like, they can have curbside assistance. Some of our airports have 24‑7 access. Others have an intercom through which you can get support. The support then comes out to meet you at the curbside. They'll take you in to see the airline. At the airline, you check in and then you're moving through the rest of the system with them.