A long-haul low-cost operation would be harder to differentiate from a conventional airline as there are few cost savings possibilities, while the seat costs would have to be lower than the competition. Long-haul aircraft scheduling is often determined by time zone constraints, like leaving the US East Coast in the evening and arriving in Europe the following morning, and the longer flight times mean there is less scope to increase aircraft utilization as in short-haul. The business model is financially risky, and many companies have entered bankruptcy, like Laker Airways.