$ ec2-run-instances --region us-east-1 \
--availability-zone us-east-1a \
--group default \
--key foo \
--instance-type t1.micro \
ami-XXXXXXXX
Server.InsufficientInstanceCapacity: We currently do not have sufficient t1.micro capacity in the Availability Zone you requested (us-east-1a). Our system will be working on provisioning additional capacity. You can currently get t1.micro capacity by not specifying an Availability Zone in your request or choosing us-east-1d, us-east-1b.