We follow the ICAO code, which is very clear about the goods that can be transported, be it by aircraft reserved for transporting cargo or aircraft transporting cargo and passengers. There are very strict rules about that. For each carrier, we choose the categories of dangerous goods that we are willing to transport. We do our own evaluation.
Since we mainly transport passengers, we have established our own additional restrictions regarding certain dangerous goods that we refuse to transport. I know that WestJet, for example, doesn't transport any dangerous goods. It's a choice based on an evaluation of the risks associated with the activity.
As Marc-André mentioned, the whole area of the transport of dangerous goods by air is highly regulated and very strict. Our safety management system enables us to analyze the risks internally and determine whether we are going to transport a certain kind of material.