said the following on 6/4/2006 2:33:
When I made a connection af Frankfurt from a Lufthansa filght at one of
the A gates to a United flight at one of the C gates, I had to go
through an air side security check point. Or, at least, it never felt
like I left the secured areas. Why did they do this? Was it just a
ploy to reduce German unemployment, or do passengers arriving on LH
present more of a risk?

This is common practice in many airports.
Try HKG, NRT, i believe BKK too.