Milestones

Ten years ago: An airliner crashed in southwestern China, killing all 108 people on board, according to the official Xinhua news agency.

Five years ago: Allied warplanes attacked targets in “no fly” zones in southern and northern Iraq. The Martin Luther King Jr. holiday was observed in all 50 states for the first time.

One year ago: Former Massachusetts Sen. Paul Tsongas, who rebounded from cancer to briefly become the Democratic front-runner for president in 1992, died in Boston of pneumonia at age 55.