Will an iPad 1 fit into a iPad air case?
Generally the iPad 1 can't share the same case with iPad 2
except some specific case design for both ipad, such as the leather
Bluetooth keyboard for ipad 1 ipad 2.
A slip-style case that is strechy or a generic notebook case
will fit both models. Since the iPad 1 is thicker, cases that hold
the tablet with leather, metal or other rigid forms will not work.
The iPad 1 will not work with the smart cover, or other compatible
cases either, as it lacks the magnetic switches and edges.