Date: 1941 the point in the flight of an aircraft beyond which the remaining fuel will be insufficient for a return to the starting point with the result that the craft must proceed, a critical point at which turning back or reversal is not possible
POINT OF NO RETURN
Meaning of POINT OF NO RETURN in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012