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The Montreal Protocol is signed

The Montreal Protocol on Substances that Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. As a result of the international agreement, the ozone hole in Antarctica is slowly recovering.

Mikoyan MiG-31 interceptor makes its maiden flight

Development of the MiG-25's replacement began with the Ye-155MP prototype which first flew in 1975. Although it bore a superficial resemblance to the MiG-25, it had a longer fuselage to accommodate the radar operator's cockpit and was in many respects a new design.

Anniversaries of famous