Don't travel while sick. If you have a weakened immune system or are at increased risk for severe disease talk to a healthcare professional before you decide to travel.
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Infectious Diseases
An airline can deny boarding of any passenger who looks unwell, especially if they suspect the passenger might be infectious (infect other passengers).
It is important to note that an airline has the right to refuse a passenger if staff believe that the passenger meets the following conditions: if the passenger could be considered a potential safety hazard, might require medical attention during the flight, has a condition that might deteriorate during the flight, or ...
A study by MIT scholars estimates that from mid-2020 through early 2021, the probability of getting Covid-19 on an airplane surpassed 1 in 1,000 on a totally full flight lasting two hours at the height of the early pandemic, roughly December 2020 and January 2021.