xkcd #3241: Horizontal Stabilizers
Title text:
It started as a mistake that everyone was afraid to admit to, and then it stuck because removing it 'looks silly.'.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3241/
Fighter jets are basically rocks that have huge jet engines strapped on to them, if it has propulsion, it stays on the air. But if it loses engines, it drops like a stone.