Access from landside areas to airside areas is tightly controlled at most airports.
From the en.wikipedia.org
It's located on the ticketing level of the landside terminal and is open to all visitors.
From the post-gazette.com
Landside areas include parking lots, public transportationtrain stations and access roads.
From the en.wikipedia.org
Meanwhile, just as important is the landside connecting apparatus.
From the alankandel.scienceblog.com
Both have shops and restaurants, landside and airside.
From the en.wikipedia.org
Airports are divided into landside and airside areas.
From the en.wikipedia.org
Landside areas include parking lots, public transportationtrain stations, tank farms and access roads.
From the en.wikipedia.org
I was escorted down a corridor and through a door where I could join the stream of new arrivals going landside.
From the independent.co.uk
Landside Terminal Level 3 at the observation deck includes paintings, sculptures, glass art and mixed media presentations.
From the en.wikipedia.org
More examples
Component consisting of a side piece opposite the moldboard
An airport is a location where aircraft such as fixed-wing aircraft, helicopters, and blimps takeoff and land. Aircraft may be stored or maintained at an airport. ...
In the publicly-accessible area of an airport (before passport and customs control)
Those parts of an airport not considered airside. Access is open to all persons legally entitled to be at an airport, subject to local and national laws.
All aspects of an airport that take place before security checks.
Landside is "this side" of the air cargo terminal at an airport. When a consignment has been checked and is put into the airport's secure area it is then airside.