Certainly, air transportation is going to continue to be vital to the development of the north. It's the only reliable mode of transportation for 12 months of the year and it's very, very heavily used. The airports have been developed fairly well in the north so that higher-capacity planes can land. That's one of the considerations in science, for example, in terms of what kinds of facilities there are in various communities when we're looking at locations for the arctic research station.
It is, however, very expensive, and it's not the most friendly mode of transportation from the perspective of greenhouse gas emissions. Having that ice road to the diamond belt is very important. When it failed, there were some pretty serious consequences for those companies. They had to rely on some airlift for some of their equipment, and of course for fuel. That drove their cost structure way out of whack.
These are very important issues that will determine the pace of development in the future.