<human>:  When did the Berlin Airlift start and when did it end?
<bot>: The Berlin Airlift began in June 1948 and ended in May 1949. The airlift was a major humanitarian operation that delivered supplies to West Berlin, which was surrounded by the Soviet Union. The Soviets were preventing food and other supplies from entering the city, so the USA, UK, and France flew in supplies by air. The USA alone delivered more than 2 million tons of supplies.