Originally Posted by buckeyefanflyer

There is not easy answer to this. Almost every airport has difrerent layouts
as to what concessions are pre-security, or which ones are in different terminal areas and what access you have. The same applies to airline clubs too.
After 9-11, the hard rule was you must have a same-day to be screened to entered a secured area in a airport. You have a same day ticket but you want to entered a different terminal/concourse to visit a particular restaurant.
Some airports will let you, some won't. I can give you an example of something that happended today at CMH. The only airport Starbucks is on the A concourse. Someone with a ticket to a different concourse wanted to enter A to go to Starbucks and they let her get screened and go there. It was not very busy at the time so this may have helped.