Flight attendant Natalie Magee, who has 20 years of experience, advises passengers to avoid using airline blankets due to potential hygiene issues. She warns that blankets may harbor germs, bodily fluids, and even mold, as they are not always laundered after each use. Magee suggests bringing your own blanket to ensure cleanliness while flying. Additionally, she shares other in-flight pet peeves, such as passengers not washing their hands after using the restroom and changing babies on tray tables. Magee emphasizes the importance of treating the aircraft with respect and appreciates passengers who are polite and considerate during flights.