Almost 65 years after Allied planes flew Western supplies into blockaded Berlin, a new American import is arriving by air: craft beer.

The beer is being flown in due to a new surge of German interest in American brewing that's upending a centuries-old relationship in which German beer defined the gold standard for brewing and Americans emulated it.

Now, with craft brewers in the United States capturing an ever greater share of their home market, they are expanding into Germany as well. German consumers, intrigued by unfamiliar flavors, are purchasing more imported beer and are increasingly copying American efforts in their own small-scale brewing operations.