President Lech Kaczynski and several other senior Polish officials were among 96 people killed when their plane crashed in thick fog on its approach to a Russian airport on Saturday, officials said.
Here are some details of major plane crashes in the last three years:
January 1, 2007: An Indonesian Boeing 737-400 operated by budget carrier Adam Air disappeared from radar screens during a flight from Java to Sulawesi islands. Wreckage was located at sea 10 days later. All 102 passengers and crew were killed.
May 5 - All 114 people on board a Kenya Airways Boeing 737 died when the plane crashed in torrential rain after takeoff from Douala in Cameroon, bound for Nairobi.
July 17 - A Brazilian TAM passenger plane crashed into buildings when trying to land in Sao Paulo, killing 199 people aboard and on the ground.
September 16 - One-Two-Go, a budget Thai airliner carrying 123 passengers and several crew crashed on landing at the resort island of Phuket. At least 85 of the 123 passengers were killed and five of the seven crew.
August 20, 2008 - A Spanair MD-82, flying to the Canary Islands with 166 passengers and six crew, crashed on takeoff at Madrid airport killing 154 people. The remaining 18 were seriously injured.
August 24 - A Boeing 737-200 belonging to a private Kyrgyz company Itek-Air, chartered by an Iranian company and bound for Iran, crashed at Bishkek airport. Around 70 people died, including members of a local teenage basketball team.
May 20, 2009 - An Indonesian C130 military transport plane carrying 110 passengers and crew crashed and burst into flames 6.5 km (4 miles) from the Iswahyudi air force base in East Java while preparing to land, killing 98 people including two on the ground.
June 1 - An Air France Airbus A330-200 jetliner carrying 228 people crashed over the Atlantic. Fifty-one bodies and 600 pieces of wreckage were recovered before the search for survivors was called off on June 26.
June 30 - A Yemen Airways aircraft carrying 153 people crashed in the sea off the Indian Ocean archipelago of Comoros.
July 15 - A Caspian Airlines aircraft, carrying 153 passengers and 16 crew travelling from Tehran to Yerevan in Armenia, crashed near the city of Qazvin killing all aboard.
January 25, 2010 - An Ethiopian Airlines Boeing 737-800 crashed minutes after taking off from Beirut airport in stormy weather, plunging in a ball of fire into the sea. All 90 passengers and crew were killed.
April 10 - Ninety-six people aboard the Polish president's official Tupolev Tu-154 plane were killed in a crash near Smolensk airport in western Russia.
-- The plane was carrying President Lech Kaczynski, his wife Maria, central bank governor Slawomir Skrzypek and several other senior officials, including the chief of Poland's military Franciszek Gagor and Deputy Foreign Minister Andrzej Kremer.