I could find only one reported sighting, O'Hare International in Chicago, IL, in 2006-7.
Point of interest:Xiashoan, China had one reported sighting.
So few sightings are actually reported, there are no reliable statistics available.
So few sightings are actually reported, there is no way to know that answer.
On average there are over 600 reported sightings of UFOs annually.
There is no airport in Puru, Estonia (a village outside Jõhvi).There are 234 airports (as of 2010) in the country of Peru, including military bases and small, remote airstrips. Of these, 73 are main airports and 3 are major international airports (Lima, Cusco, and Arequipa).
Who Knew - 2010 UFO Sightings 4-22 was released on: USA: 21 June 2011
Most Extreme Airports - 2010 TV was released on: USA: 20 July 2010 Australia: 28 October 2010
Most Extreme Airports - 2010 TV is rated/received certificates of: USA:TV-PG
1 Sep 2010 ... Database with FBO & Handlers at 600 Airports in Europe ...
The AAI stands for Airports Authority of India. As of January 2010, the AAI regulates 115 airports total in the country, including 23 civil enclaves.
MLB reported a total attendance of 73,061,763 in 2010, down 446,434 from 2009. Average attendance per game in 2010 was 30,067 and in 2009 was 30,300.
Fact or Faked Paranormal Files - 2010 Unwanted Visitors Strange Sightings 1-2 was released on: USA: 22 July 2010 Germany: 23 December 2010 Hungary: 13 January 2011
4,502 in 2010.