The crew of a Moscow-bound Polish plane has canceled a landing in Sheremetyevo Airport outside the Russian capital in thick fog and returned to the city of Krakow, an airport spokeswoman said. Two more aircraft from Russia\'s south and Egypt had to land in other airports in the Moscow Region because of the fog, she added. On April 10, 2010, then Polish President Lech Kaczynski\'s Tu-154 plane crashed in heavy fog as it attempted to land at an airfield near the western Russian city of Smolensk. Kaczynski, his wife and a host of other top officials on board were killed.