They fly to over 10 destinations in India. I don't think there is a limit.
The airline TUIfly Vermarktungs flies to dozens of destinations in many different countries and continents across the globe, although some destinations are only seasonal. Examples include Chicago, Hong Kong, Cape Town and Osaka. However, most destinations are in Europe, they have only two destinations in South America and they do not fly to Australia.
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Island Air is a commuter airline which is based in Honolulu, Hawaii. Some of it's destinations include Kailua-Kona, Hawaii, Kahului, Maui, and Lanai City, Lanai.
radar
Aero Mexico can fly to quite a number of various destination all over the world in many different countries and continents. These destinations can stretch to Asia, Canada, Central America, Europe, Mexico, South America, and the United States.
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Some of the destinations one could go with Thompson Airways are Africa, Asia, Australia, Asia, North America, and South America. One could also fly to the United Kingdom.
Jet Airways, as of February 2011 has 71 destinations with 24 being to International destinations and the other 47 being in India.
Some of the cheapest countries to fly to from Seattle include Mexico, Canada, and Costa Rica. These destinations often have affordable flight options available for travelers.
Check http://www.manchesterairport.co.uk/manweb.nsf for destinations list.