Most intercontinental routings reach Kilimanjaro late in the evening. A driver meets the flight and makes the hour's drive into Arusha, so the first morning starts rested rather than straight off an aircraft. Nothing is scheduled for this day beyond the transfer and a night's sleep.
Morning
No activity. The day is held open for arrival.
Afternoon
No activity. Guests arriving on a daytime flight have the afternoon free in Arusha.
Evening
Met at Kilimanjaro International Airport, transfer to the hotel in Arusha, about an hour. Check in, dinner where the arrival time allows, and an early night.
Flights from Europe land at Kilimanjaro after dark, so the first night is spent in Arusha and the safari begins the next morning rested rather than straight off an overnight flight.