CATSA allows kirpans with blades of up to 6cm to be worn on flights domestically in Canada and to all international/domestic destinations, except the USA. If you have a transit stop over for your flight, you will have to ensure that the stop-over country also allows small kirpans. The UK and New Zealand allow small kirpans whereas India does not. Larger kirpans can be checked in with luggage.
The kirpan can be worn through security and the CATSA screening officer will ask to see the kirpan and may ask that it be removed from the sheath to be measured.
If you are requested to hand over or remove your kirpan, please request to speak with a supervisor.