- https://www.cnn.com/travel/article/airplane-airport-germs/index.html
- https://time.com/4877041/dirtiest-places-on-airplanes/
- https://www.cbsnews.com/news/how-risky-are-air-travel-germs/
- https://www.forbes.com/sites/geoffwhitmore/2019/03/20/how-dirty-are-airplanes/#5a540fd52ebb
- https://www.businessinsider.com/dirtiest-places-on-a-plane-2015-9
- http://www.nbc.com/late-night-with-seth-meyers/video/ben-carson-vs-trump-pinky-the-dolphin-monologue/2904985
- https://www.facebook.com/travelmath/photos/a.717015294979890/1170673426280739/?type=1&theater
- https://www.facebook.com/travelmath/photos/a.717015294979890.1073741826.205407442807347/1170673426280739/
- https://www.youtube.com/watch?v=Ov67sySm3tg&feature=youtu.be&t=500
- https://blog.travelmath.com/
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