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Click here to see the two best teams in the world together in formation
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Underneath the jets there are two fuel pods (tanks) which contain diesel fuel.
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There is a tube from each tank to the exhaust at the back of the engine. The pilot squeezes a trigger on the control stick which starts the flow of diesel from the tank to the engine exhaust.
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When the diesel fuel enters the exhaust, it immediately vaporizes and creates a white smoke trail. To stop the flow of diesel fuel, the pilot squeezes the trigger one more time.
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 This smoke trail dissipates before it reaches the ground and is considered harmless.
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 The Snowbirds have two jets that are flown by the Coordinators that are used as spare aircraft for the performance.
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If at any time during the performance one of the nine jets becomes unserviceable, the pilot lands the jet and uses one of the spare aircraft.
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Since the Snowbirds do not have any spare pilots, if one of the pilots gets sick, then that person cannot fly in the show.
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 The Team will then make minor changes to their performance and fly without that one pilot. 
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The Snowbirds leave their home base in Moose Jaw, Saskatchewan and travel to Comox, British Columbia in April each year for about two weeks to practice over different terrain.
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The solos aim to be approximately 10 metres apart when they cross. With a speed of close to 600 km/hr for each jet, the closure speed of the jets is very close to the speed of sound.
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Starting in May until mid-October each year the team travels across North America performing at various air shows.
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Throughout the six month air show season, the Snowbirds return to their home base about four times for a couple of days to perform some maintenance on the aircraft. 
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Next a brief Squadron history:
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On 11 November 1942, 431 Bomber Squadron formed at Burn, England. They were in England for the duration of the war and moved to RCAF Station Dartmouth, Nova Scotia, after V-E Day, disbanding there on 5 September 1945.
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431 Fighter Squadron formed at RCAF Station Bagotville on 18 January 1954 in order to display the Sabre to the public at airshows. They were disbanded on 1 October 1954.
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They were re-activated on 1 April 1978 as 431 Air Demonstration Squadron, more commonly known as the Snowbirds, flying the CT-114 Tutor.
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On 15 October 2004, 431 Sqn was presented their Squadron Colours, for 30 years of service.
Information source : official Snowbirds site
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