Passenger flights on the aging, characterful, but more fuel- and maintenance-heavy Boeing 757revolve nearly entirely around the USA. This is due to 
Delta Air Lines and 
United Airlines,which jointly have 176 757-200s and 757-300s and benefit from low ownership costs. According to Cirium Diio information for January 2025, the US has a phenomenal 96% of all 757 passenger flights globally.