That and this way they don;t have to spend money starting their own route....I have one problem with this, and that is, Bilateral agreements between nations are what dictate how and when a route will be established. For example the bi-lateral agreement between Indai and Canada has existed for many years, but for the last 5 years no airline has operated a route between the two nations. Now, Canada 3000 will begin service to India in the fall, but under the original bi-lateral which means a code-share is not required for the route. If India demands that C3 codeshares with Air India on the route, and it is not stipulated in the Bilateral, then that is a violation of International law, and as such would be decided at the Hague. That said, India could just as well forbid a C3 plane from landing in India, in which case they have just started an international incident, and one which would not cause to many problems for Canada, but could be disaterous for India, given the huge amounts of trade that go on between the two nations, mainly Canada sending to India. Not to mention the very large indian community that travels to india every year.
"Clive Beddoe says he favours competition, but his actions do not support that idea." Robert Milton - CEO Air Canada