Event:
Planes return to the air in Germany, France and Italy after being grounded by ash clouds from Iceland's Eyjafjallajokull volcano
More Notable Events on April 20:
1996 Chicago Bulls win record 72 games in a season
1992 Madonna signs $60-million deal with Time Warner
1983 President Reagan signs a $165B bail out for Social Security
1977 Woody Allen's film "Annie Hall" premieres
1971 U.S. Supreme Court upholds use of busing to achieve racial desegregation
