Republic Airways late last month exercised purchase options on 30 Embraer E175s, bringing the total number of E-Jets ordered by the Indianapolis-based regional airline to 78. Republic, which took the options from US Airways, will fly the airplanes in an 86-seat cabin layout in US Airways Express livery starting next year. The parties expect deliveries to continue through 2008. The transfer does not affect US Airways’ firm and conditional orders for E190s.