Hello, about 6mos ago I booked a nonstop flight from the US to Frankfurt to Lisbon on May 17th using Aeroplan points. I got a decent deal at 70k points in Business + $100 or so.

I'm hoping to change the second leg of my flight to a late departure to spend the day in Frankfurt. Air Canada says Yes there are 2 flights in the evening on Lufthansa and TAP Portugal, but Aeroplan has no award seat availability on those flights and that ticket alone is approaching $500.

When does this type of availability get opened? Any hope if I wait around it may become available?