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/
Ok, but passenger jets are just tubes with wings stuck to them, not a kite with rockets strapped to it...