Ключевые слова: 19, aircraft, airport, app, border, canada, cellphone, certification, device, digital, europe, flight, flying, holding, holiday, immunity, immunization, immunized, internet, mobile, onboard, online, pandemic, passenger, passport, phone, plane, proof, screen, tech, technology, texting, tourism, tourist, travel, traveler, uk, usa, using, vacation, vaccinated, vaccination, vaccine, virus, wifi, woman,