Ключевые слова: airplane, airport, back, business, calendar, cartoon, change, clock, confusion, cycle, date, day, different, fall, fatigue, flight, fly, forward, icon, ikon, illustration, jet, jetlag, lag, night, passenger, plane, plus, question, sheet, shift, sleep, sleepy, spring, staffing, stroke, summer, sun, switch, time, tired, travel, update, waitlist, winter, work, zone,