ID issue or old rule?

[freelancer knux]

Hey guys I was thinking of getting a Liner but when I checked the wiki I came across this:

Liners are large, slightly more defended ships specifically designed to transport people- although they are capable of filling their holds with other commodities as well. Most factions do not have access to Liners, and those that do have it specifically listed on their ID. For other purposes, a liner is exactly like a transport, just with more armor and firepower.

so I checked a few IDs and saw no reference to using a Liner only transports. So question is: Is it an old rule that doesn't exist anymore or do you need a special ID?
(I really did try figuring this out on my own so I hope I don't look like a moron asking this)

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