be flown to Cuba. The airliner diverted to Panama City, Panama, where the hijacker was arrested. The Grateful Dead made the last of a run of three appearances at Fillmore East, one of their last performances at the venue. Bolivia nationalizes the American-owned Matilde zinc mine. Died: Nikolai P. Barabashov, 77, Soviet astronomer and co-creator (in 1961) of the first map of the far side of the Moon April 30, 1971 (Friday) The Milwaukee Bucks won the NBA championship, sweeping all four games of the series against the Baltimore Bullets. The Bucks, with Lew Alcindor (who would soon change his name to Kareem Abdul-Jabbar) and Oscar Robertson, beat the Bullets, 118 to 106, after winning the first three games 98-88, 102-83 and 107-99. The Bullets were outclassed despite having future Hall of Famers Wes Unseld and Earl Monroe on their roster. The Joint Social Welfare Institute was created by the government of Costa Rica. In the U.S., all F-111s were grounded as a result of the fatal accident on April 23, after it was determined that the recovery chute compartment door had failed to separate, making crew escape impossible. The day before Amtrak took over passenger train operations in the United States, Union Pacific Railroad and Chicago and North Western Railway terminated the operation of the City of Los Angeles and City of Denver trains, while the Capitol Limited train, flagship of the Baltimore and Ohio Railroad, made its final trip, and the United States Post Office Department canceled all but one of the eight remaining Railway Mail Service routes References 1971 1971-04 1971-04