 On one occasion Gerald Nairn journeyed from Rutbah to an Iran Petroleum Company post more quickly than an Imperial Airways aircraft that left at the same time.The cars were also cheaper, costing £30 per passenger from Beirut to Baghdad, compared to £150 by air from Cairo to Baghdad.At first only two cars made the trip weekly, but by 1925, eight or nine, or even twelve, cars were travelling at the same time.