Ключевые слова: 7, 7 december, agenda, air, appointment, aviation, background, business, calendar, celebration, civil, concept, date, day, deadline, december, design, diary, event, flat, flight, holiday, illustration, international, management, meeting, month, monthly, office, organization, organizer, page, paper, passenger, plan, plane, planner, remind, reminder, schedule, sign, table, time, timetable, transport, transportation, travel, week, world, year,