First of all, sorry for doubleposting.
Below is one of the great "what-ifs" of post-war aviation, one of the few supersonic aircraft built in a country not being a major industrial power and the last aircraft designed by Willy Messerschmitt.
It begun it's life in Spain (where Messerschmitt moved with combat aircraft design when such activities were forbidden in Germany) in early 1950s, but the initial development was slow and by 1959 only a wooden glider in tailless-delta configuration was built. Because of the problems with stability the flight test program was cut short and year later the whole program was cancelled.
Spain, Hispano P.300
Thereafter the design team moved to Egypt which aimed to create strong defence and aerospace industry. There the work proceeded but with aircraft being re-designed into more conventional layout (with conventional tail). First prototype, powered by Bristol Orpheus engine, flew for the first time on 7 March 1964, followed by second prototype on 22 July 1965. The whole project was met with great interest from India which also provided part of the funding, especially for the Brandner E-300 engine that was installed in third prototype that first flew in 1969 and managed to achieved twice the speed of sound. At the time, however, cost of the project, coupled with costs of re-arming Egypt's military after Six Day War (and still-raging War of Attrition) led to cancellation of the program.
Egypt, Helwan HA-300
Note: Interestingly, although there exist a number of fan-art drawings of HA-300 in various fictional paint schemes - mostly of Spain and Egypt but also of other users, including Nazi Germany ( ), they seem to be based rather on first two prototypes - perhaps because they had more graceful lines, but also because they are better known - and more photographed - than third prototype.