The National Post reports in its Wednesday edition that some of Canada's major airlines say their water is safe following a new study claims many U.S. airlines are using "potentially unhealthy water" for coffee, tea and hand-washing. The Post's Courtney Greenberg writes that Air Canada, Flair Airlines and Air Transat told the Post that they adhere to water safety guidelines. (WestJet declined to comment.) For the 2026 Airline Water Study, researchers tested water provided on flights between October, 2022, and September, 2025. The Center for Food as Medicine & Longevity observed 10 major U.S. airlines and 11 regional airlines. "Airlines often respond to our findings by saying they comply with U.S. Environmental Protection Agency guidelines," it said. But researchers warned travellers to "never drink any water onboard that is not in a sealed bottle," and to stay away from coffee or tea offered on flights. They also said that an alcohol-based sanitizer should be used instead of washing hands in an airplane bathroom. Airline water systems "can face stagnation, temperature fluctuation, and maintenance complexity, all of which can contribute to microbial contamination risk or persistent hygiene challenges."