Republic has 32 170's and 34 175's 2 or 3 more 175's are still coming for Republic for UsAir flying.
Shuttle has about 44 170's most are for United and I think 15-or 16 are for Delta. Shuttle is starting to take delivery of 175's in the 76 seat configuration starting I believe next month. As the 175's for shuttle start coming online the Delta 170's will be moved over to United flying. My numbers are a rough estimate I could be off a little.
This could possibly be bad news for someone..... The new TA says that there will be a maximum of 120 71-76 seat aircraft. Compass has 36, Mesaba has 36, Pinnacle has 15, Mesa has 15, and Republic has 16?. That's 118. How many do Comair, Skywest/ASA have?