Earlier this month, Nav Canada published the details of the airspace closures for the G8 and G20 summits in Southern Ontario.
You can view the details by taking a look at AIP Supplement 11/10.
Here is the low down for the G20 summit in Toronto:
There are going to be two rings of restricted airspace, a 15nm and 30nm area over the city. The restriction is from the surface to 18,000′.
Pilots will have to file their flight plans (flight itineraries are not allowed) with London FIC 60 minutes before departure. You must have a transponder and will be given a code by either London FIC when you file, or by your local ATS unit.
When planning your flight, if it transits through the restricted airspace you need to provide a fix just outside of either side of the restricted area. I’m making the assumption so that ATC knows where you will enter and exit the restricted areas.
Don’t do anything stupid. No acrobatics, flight training, air exercises, or hot air ballooning will be allowed in the area. This goes the same for city tours. Essentially GA aircraft will only be allowed to take off, land, or transit through the restricted area.
All traffic within the restricted airspace will be monitored by surveillance radar and any unauthorized aerial activity will be subject to intercept by military aircraft under the authority of the Government of Canada. Therefore, it is imperative that all pilots operating within or near CYR542 review the CFS, Section F–Emergency Procedures–Interception of Civil Aircraft to ensure they know and understand their responsibilities if intercepted.
The good news is that this will only be in effect for the actual event (26 June to 28 June 2010), not the weeks leading up to it.