The Basic 64-bit Amazon Linux AMI has the following instance type options available:

• Micro
• Large
• Extra-Large
• High-Memory Extra Large

... etc

I booted up this AMI as a micro type, made customizations, shut it down, detached the volume, took a snapshot, and registered my own custom AMI: ec2-register –snapshot [snapshot_id] –description "my description" –name "my name" –kernel aki-427d952b

That worked. HOWEVER, when I try to create an instance from my custom AMI, only the following instance types are available:

• Micro
• Small
• High-CPU Medium

... which coincidentally are the same instance types available if you try to boot up the 32-bit Amazon image.

Why are the available instance types of my custom image varying from the available instance types of the image I based it off of?