The answer is zero. It would cost ticket holders absolutely nothing. It would only increase the operating cost of your airline, which would make it harder for them to compete during contract negotiation time with their major partner. Other less expensive regionals, with less overhead, would offer lower rates.

Remember, if you're at a regional airline, you don't work for the livery on the tail. The customer never buys the ticket from Piedmont, Chautauqua or Comair.

But best of luck during negotiations. Being a sub-contractor is a bit&*.