Cold War History- The "Little Lift" Berlin Airlift began 1 April 1948.

'On the evening of March 31, 1948, US military trains [entering] the Soviet Zone were denied entry.  All US military trains to and from Berlin were canceled, and laid on an airlift. This became known as the "Little Lift"...Just as Western military leaders seemed to understand the potential of a war situation developing by attempting to force an armed convoy through to Berlin, the Soviets appeared to understand the same could be true if they attempted to force the issue in the air over Berlin.'