In the United States, airlines have limitations on how many regional aircraft a company may operate. The Embraer E170 fits neatly into the 51-76 seat block, while the E175 is in a gray area. Despite having a higher maximum capacity, the scope clauses restrict the E175 to flying with 76 seats or fewer installed. In response, Embraer introduced the E175SC in 2017. This option is available on new orders and as a refit or existing aircraft, lowering the maximum seating to 70 seats. Scope clauses also damaged the sales prospects of the E175-E2, as projected changes that would accommodate larger aircraft did not come through.