There are many different companies that provide third party liability insurance - that which is commonly referred to as "Green Card" insurance - to riders from outside Europe who want to ride a motorcycle registered outside of Europe within Europe.

There is a whole sub-forum here on the HUBB devoted to this topic, go have a look at this sub-forum: Trip Paperwork. Prices vary dependant on two factors, one being the country in which the provider purchases the policy, the other being how much the provider marks up the policy to cover their administrative charges. At present, the least expensive coverage that I know of is available from Ivo at Moto Camp Bulgaria - that will probably cost you less than €250 for 3 months. Other well-known providers are listed in the sub-forum. Go spend some time in that forum and you will find all the information you need.

Be aware that "Green Card" insurance for non-European vehicles is a fungible product, just like gasoline. The coverage provided is identical no matter who sells you the product, so, make your choice of provider based on the service they provide you and the price they charge.

On the contrary, the information I posted is very correct. I've shipped my motorcycle by air between continents many times in the past 25 years, and I am also a retired aircraft pilot.

Air Transat tends to be less expensive than Air Canada because they frequently have excess cubic space available in the hold, this because they don't operate the frequency that sched carriers do on TA routes and hence don't have the same demand for cargo shipments that AC does. A 300 kg motorcycle stuffed into an otherwise empty LD6 container (capacity 3,000 kg) is "money for nothing" to a carrier that would otherwise depart with empty space down below.

In past years, AC has offered some very attractive fares during summertime for motorcycle shipping. This program stopped during the pandemic. It remains to be seen whether AC will bring it back next summer. In the meantime, Air Transat continues to offer very attractive deals on motorcycle shipping. You don't deal directly with Air Transat for this service, instead, you book through a company that specializes in motorcycle transport, which is Motorcycle Express in New York state.

Michael