国际英语新闻：Polish president, 96 others killed in Russia plane crash

Kaczynski and Jaroslaw formed the socially conservative Law and Justice party in 2001 under the banner of developing the country's education and economy, fighting corruption and reforming rural areas.

According to the Aviation Safety Network, there have been 66 crashes involving Tu-154s, including six in the past five years. The Russian carrier Aeroflot recently withdrew its Tu-154 fleet from service.

Poland has long discussed replacing the planes that carry the country's leaders but said they lacked the funds.

The presidential plane was fully overhauled in December, the general director of the Aviakor aviation maintenance plant in Samara, Russia, told Rossiya-24. The plant repaired the plane's three engines, retrofitted electronic and navigation equipment and updated the interior, Alexei Gusev said. He said there could be no doubts that the plane was flightworthy.