Final answer:
An aerospace vehicle with a Red X condition may be released for a one-time flight under tightly controlled and specified operating conditions.
Step-by-step explanation:
An aerospace vehicle with a Red X condition may be released for a one-time flight provided the aerospace vehicle is or can be made airworthy under tightly controlled and specified operating conditions. This means that if the aerospace vehicle meets the required conditions and can be made safe to fly, it can be allowed for a single flight, but only under strict regulations.