Considering the dangers associated with spreading a disease why are people who are affected by communicable diseases told not to travel on airplanes?

People affected by communicable diseases are advised against traveling on airplanes to prevent the spread of infections to others in close quarters. Airplanes have confined spaces and limited ventilation, making it easy for pathogens to transmit among passengers. Additionally, the risk of outbreaks increases when infected individuals travel, potentially leading to wider public health emergencies. Thus, restricting travel helps protect both the affected individuals and the public at large.