Wreckage is seen at the site of a Boeing 737-500 crash at Kazan airport Nov 17, 2013 in this handout photograph provided by the Russian Emergencies Ministry. A Boeing 737-500 airliner crashed on landing in the Russian city of Kazan on Sunday, killing all 50 on board and highlighting the poor safety record of Russian airlines that ply internal routes across the world's largest nation. Best quality from source. [Photo/Agencies]