It is an authentic service which is provided for Turkish Airlines passengers, the shuttle service is operated by a third party company. The website and system is currently in the late phases of the development stage and early phases of the implementation stage.

The shuttle requires booking and currently only travel agencies can do that. Notice "Travel Agency Login" on the upper right corner in the web site.

Travel agencies make shuttle bookings based on ticket numbers and email address. After booking is complete, passenger receives a voucher, which they will use with a photo ID to board the shuttle. However should the passenger not receive it or accidently delete it they can search their voucher in the main page using their ticket number and email address.

That is why putting in a random number will not yield results.

Turkish Airlines is also promoting this shuttle service. They just did a few events last week in San Diego for travel agencies in the area.