Let's say that, with some other changes, that there is a potential for 50 Boeing 717's to be placed in Air Canada in a "knock out" deal. If Airbus were to place A318's, the number would be maybe a split with A319 and CRJ's.

I would think that what AC would do right now is take 4 or even 6 340-600's, under my theory that UA will be severely curtailing some routes, and that between US Airways and Air Canada, more traffic will codeshare. It may seem odd, but they still give quite a bit of cargo capacity.

I don't see any need for new product in the middle, and the 345's are already on the way, so I can't picture taking any smaller planes from anyone outside of the under 120 passenger range.

The 747's really stink right now. I don't know how many Singapore still have, but they have been looking to sell or lease their machines for a while. I don't see any serious opportunity to wet-lease on the horizon either, but you never know what corner of the world will see a sudden need for them.