To amend title 10, United States Code, to authorize space-available travel on military aircraft for members of the reserve components, a member or former member of a reserve component who is eligible for retired pay but for age, widows and widowers of retired members, and dependents.

Space-Available Act of 2012 - Authorizes the Secretary of Defense to establish a program to provide transportation on Department of Defense (DOD) aircraft on a space-available basis for: (1) active duty and reserve members holding a valid Uniformed Services Identification and Privilege Card; (2) retired members who, but for not attaining age 60, would be eligible for military retired pay; (3)...