From the Violin Channel:

Air Canada jets
Air Canada has today published a detailed explanation of its musical instrument transportation policy – declaring violins and cellos are permitted to be taken within the cabin, but violas must be transported within the hold.
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About KindaScratchy
I'm a novice fiddler and mandolinist. I've played the guitar for many years and also play the recorder, fife, flute, and, more recently, tin whistle. I work in the communications field and, in addition to music, I enjoy photography, writing, gardening, golf and travel.