Had to look up rendition flight;
rendition
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Related to rendition: Extraordinary rendition
rendition
the practice of sending a foreign criminal or terrorist suspect to be covertly interrogated in a country that has less stringent regulations regarding the humane treatment of prisoners
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree
Hope this is true.
Process of Rendering
https://www.thespruceeats.com/what-does-render-mean-2313707
Rendering can be done both commercially as well as in a home kitchen. The overall meaning of rendering is to take animal tissue that would otherwise be discarded and convert it into materials that can be used in some way. More specifically, this means rendering the whole fatty tissue from animals and turning it into fats that are purified, like lard and tallow (used in making soap and candles). When we are rendering at our stove, this is on a much smaller scale. Home cooks will render pork fat into lard, butter into clarified butter, and chicken fat into schmaltz.