Apparently this is something done in regions considered to have high stowaway risk. (Don't remember the source - it was mentioned in one of the news outlets cov

Apparently this is something done in regions considered to have high stowaway risk. (Don't remember the source - it was mentioned in one of the news outlets covering this.) However, this isn't done in most airports, since it's not really seen as being worth the effort. In particular, it's simply not supposed to be possible for somebody to sneak onto the tarmac unnoticed.