Question: In what year did the principal Canadian airport in Nova Scotia open ?

text: Transportation in Canada
Air transport -- Principal airports
Further information : National Airports System , List of the busiest airports in Canada , and List of airports in Canada Of over 1,800 registered Canadian aerodromes , certified airports , heliports , and floatplane bases , [ 16 ] 26 are specially designated under Canada 's National Airports System [ 17 ] ( NAS ) : these include all airports that handle 200,000 or more passengers each year , as well as the principal airport serving each federal , provincial , and territorial capital . However , since the introduction of the policy only one , Iqaluit Airport , has been added and no airports have been removed despite dropping below 200,000 passengers . [ 18 ] The Government of Canada , with the exception of the three territorial capitals , retains ownership of these airports and leases them to local authorities . The next tier consists of 64 regional/local airports formerly owned by the federal government , most of which have now been transferred to other owners ( most often to municipalities ) . [ 17 ] Below is a table of Canada 's ten biggest airports by passenger traffic in 2011 . [ 19 ] Toronto Pearson , Canada 's busiest airport Vancouver International
Transportation in Canada, the world's second-largest country in total area, is dedicated to having an efficient, high-capacity multimodal transport spanning often vast distances between natural resource extraction sites, agricultural and urban areas. Canada's transportation system includes more than 1,400,000 kilometres (870,000 mi) of roads, 10 major international airports, 300 smaller airports, 72,093 km (44,797 mi) of functioning railway track, and more than 300 commercial ports and harbours that provide access to the Pacific, Atlantic and Arctic oceans as well as the Great Lakes and the St. Lawrence Seaway. In 2005, the transportation sector made up 4.2% of Canada's GDP, compared to 3.7% for Canada's mining and oil and gas extraction industries. Transport Canada oversees and regulates most aspects of transportation within federal jurisdiction, including interprovincial transport. This primarily includes rail, air and maritime transportation. Transport Canada is under the direction of the federal government's Minister of Transport. The Transportation Safety Board of Canada is responsible for maintaining transportation safety in Canada by investigating accidents and making safety recommendations.
Rank Airport Location Total passengers Annual change
1 Toronto Pearson International Airport Toronto 33,435,280 4.9%
2 Vancouver International Airport Vancouver 17,032,742 3.7%
3 Montréal-Pierre Elliott Trudeau International Airport Montreal 13,668,829 6.1%
4 Calgary International Airport Calgary 12,770,988 3.7%
5 Edmonton International Airport Edmonton 6,089,099 0.0%
6 Ottawa Macdonald-Cartier International Airport Ottawa 4,473,894 5.7%
7 Halifax Stanfield International Airport Halifax 3,508,153 2.6%
8 Winnipeg James Armstrong Richardson International Airport Winnipeg 3,369,974 -0.3%
9 Victoria International Airport Victoria 1,514,713 −1.2%
10 Kelowna International Airport Kelowna 1,391,725 1.8%