Some airlines serve "potentially unhealthy water" to passengers, study finds

TL;DR

A study examined over 35,000 water samples from 10 major and 11 regional airlines.
2.7% of samples tested positive for total coliform bacteria, and E. coli was found 32 times.
Researchers suggest passengers drink bottled water and use hand sanitizer due to potential contamination.
American Airlines, JetBlue, and Spirit received 'D' ratings, while Delta and Frontier earned 'A' grades.
The EPA's Aircraft Drinking Water Rule requires testing and disinfection, but penalties for violations are rare.
Airlines maintain they comply with EPA standards and have their own safety protocols.

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